---
product_id: 48440358
title: "OTOOLWORLD Watch Case Open Ball Friction Ball Watch Case Open Ball Battery Change"
brand: "diy crafts"
price: "¥1963"
currency: JPY
in_stock: true
reviews_count: 13
category: "Diy Crafts"
url: https://www.desertcart.jp/products/48440358-otoolworld-watch-case-open-ball-friction-ball-watch-case-open
store_origin: JP
region: Japan
---

# Inflatable air-filled ball for max grip 2.5-inch diameter precision ball Friction-based screw back opener OTOOLWORLD Watch Case Open Ball Friction Ball Watch Case Open Ball Battery Change

**Brand:** diy crafts
**Price:** ¥1963
**Availability:** ✅ In Stock

## Summary

> ⚙️ Unlock your watch’s secrets with precision and style!

## Quick Answers

- **What is this?** OTOOLWORLD Watch Case Open Ball Friction Ball Watch Case Open Ball Battery Change by diy crafts
- **How much does it cost?** ¥1963 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/48440358-otoolworld-watch-case-open-ball-friction-ball-watch-case-open)

## Best For

- diy crafts enthusiasts

## Why This Product

- Trusted diy crafts brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Versatile & Durable:** Perfect for all screw-back watches; built to last through countless battery changes.
- • **Trusted by Watch Pros:** Top-rated by experts for stubborn screw backs—join the savvy crowd.
- • **Compact & Portable Design:** 2.5-inch diameter fits perfectly in your toolkit or drawer.
- • **Inflatable Grip Technology:** Customize air pressure for unbeatable friction and control.
- • **Effortless Screw-Back Opening:** Twist with confidence—no scratches, just smooth access.

## Overview

The OTOOLWORLD Watch Case Open Ball is a 2.5-inch diameter inflatable friction ball designed specifically for opening screw-back watch cases without scratching. Its air-filled design allows customizable grip strength, making battery changes and repairs effortless. Highly rated by watch repair professionals and enthusiasts alike, this compact tool is a must-have for anyone serious about watch maintenance.

## Description

OTOOLWORLD Watch Case Open Ball Friction Ball Watch Case Opener Ball Battery Change

Review: Simple and very effective. - It worked amazingly, I was surprised how easily unscrewed the back of my both watches.
Review: Opened a s stubborn watch case back - Worked great on a stubborn watch back. I saw a review video by a watch repair person that went over the various types of screw case back opening tools. Surprisingly these ball types came out near the top. What's good about these is there is no chance of scratching the case. This tool is for screw back cases only. Snap backs need a different type of wedge tool. When coupled with a case holding vise opening a screw back case is rather easy. It requires some effort and patience. Make sure the ball and case back are clean. No choice of color but I got blue.

## Features

- The ball is already full of air + 1 ball needle
- Great for opening watch cases , Hold the watch in one hand and in the other hand, press the friction ball onto the back of the watch.
- Start twisting to unscrew the watch back.
- 2-1/2 inches in diameter
- and you can fill air by the basketball pump yourself if need full air

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN  | B07417BNF9 |
| Best Sellers Rank | #35,028 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #31 in Watch Repair Tools & Kits |
| Customer Reviews | 4.2 4.2 out of 5 stars (1,242) |
| Date First Available  | July 9, 2017 |
| Is Discontinued By Manufacturer  | No |
| Item model number  | diy_product_B07417BNF9 |
| Manufacturer  | OTOOLWORLD |
| Product Dimensions  | 5 x 3.5 x 4.53 inches; 1.1 Pounds |

## Product Details

- **Brand:** DIY Crafts
- **Color:** gold
- **Finish Type:** Polished
- **Material:** Plastic
- **Product Dimensions:** 3.5"D x 5"W x 4.53"H
- **Recommended Uses For Product:** Watch repair
- **Shape:** Cylindrical
- **Special Feature:** Portable
- **Style:** Open Ball
- **Target Audience:** Women

## Images

![OTOOLWORLD Watch Case Open Ball Friction Ball Watch Case Open Ball Battery Change - Image 1](https://m.media-amazon.com/images/I/61gXliQXl2L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Simple and very effective.
*by I***R on December 29, 2025*

It worked amazingly, I was surprised how easily unscrewed the back of my both watches.

### ⭐⭐⭐⭐⭐ Opened a s stubborn watch case back
*by R***R on May 31, 2025*

Worked great on a stubborn watch back. I saw a review video by a watch repair person that went over the various types of screw case back opening tools. Surprisingly these ball types came out near the top. What's good about these is there is no chance of scratching the case. This tool is for screw back cases only. Snap backs need a different type of wedge tool. When coupled with a case holding vise opening a screw back case is rather easy. It requires some effort and patience. Make sure the ball and case back are clean. No choice of color but I got blue.

### ⭐⭐⭐⭐⭐ Very good and also cheap
*by Y***A on January 9, 2026*

Cheap and good

## Frequently Bought Together

- OTOOLWORLD Watch Case Open Ball Friction Ball Watch Case Open Ball Battery Change
- LYECUN Air Duster, Air Blower Dust Blaster for Watch, Keyboard, Cameras Lens Cleaning
- Joyzan Waterproof Watch Gasket Paste, Professional Watch Repair Sealing Grease Lubricator Silicone Sealant Box O Ring Pocket Clock Lubricant Diver Watchmakers Repairing Maintenance Sealer Lube Tools

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.jp/products/48440358-otoolworld-watch-case-open-ball-friction-ball-watch-case-open](https://www.desertcart.jp/products/48440358-otoolworld-watch-case-open-ball-friction-ball-watch-case-open)

---

*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-01-29*