--- product_id: 498878688 title: "8 PCS Anti-Theft Post Attachment Kit Sign Mounting Hardware for U Channel Post, Sign Post Mounting Bolts and Nuts,2.5\" Bolt" brand: "diyiiron" price: "¥10829" currency: JPY in_stock: true reviews_count: 5 category: "Diyiiron" url: https://www.desertcart.jp/products/498878688-8-pcs-anti-theft-post-attachment-kit-sign-mounting-hardware store_origin: JP region: Japan --- # Anti-theft one-way bolt Fits 3/8" U-channel & square posts Zinc-coated rust-resistant metal 8 PCS Anti-Theft Post Attachment Kit Sign Mounting Hardware for U Channel Post, Sign Post Mounting Bolts and Nuts,2.5" Bolt **Brand:** diyiiron **Price:** ¥10829 **Availability:** ✅ In Stock ## Summary > 🔐 Lock it down, stand out — secure your signs like a pro! ## Quick Answers - **What is this?** 8 PCS Anti-Theft Post Attachment Kit Sign Mounting Hardware for U Channel Post, Sign Post Mounting Bolts and Nuts,2.5" Bolt by diyiiron - **How much does it cost?** ¥10829 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/498878688-8-pcs-anti-theft-post-attachment-kit-sign-mounting-hardware) ## Best For - diyiiron enthusiasts ## Why This Product - Trusted diyiiron brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Complete 8-Piece Kit:** Everything you need to secure your signs with confidence - • **Unbreakable Security:** One-way bolts + beveled nuts lock out thieves - • **Effortless Installation:** Dual-nut system ensures a rock-solid hold in minutes - • **Universal Compatibility:** Perfect fit for U-channel, square & tubular posts - • **Weatherproof Durability:** Premium zinc coating resists rust in any climate ## Overview The DIYIIRON 8 PCS Anti-Theft Post Attachment Kit features 2.5" one-way security bolts and beveled edge nuts designed to prevent unauthorized removal. Made from zinc-coated metal, this rust-resistant kit fits 3/8" holes on U-shaped channel, square, and tubular posts. Its innovative dual-nut installation system ensures fast, secure mounting for landscape or portrait signs, making it the ultimate solution for professional-grade sign security. ## Description With this post attachment kit, you can attach your sign to U-shaped channel posts, square metal posts,and tubular post.The anti-theft design of bolts and nuts can better protect your post and channelSimple installation,just install the two nuts in turn, and then tighten them with a wrench.If you have any questions, please feel free to email us. Review: Great set. Need to cut off end of bolt to prevent backing out by turning from thread end with wrench. Review: Just as described and works as it should. Easy to install. ## Features - The anti-theft post attachment kit is designed for fasten signs easily and securely,suitable for 3/8" holes U-shaped channel posts, square metal posts,and tubular post. - 【Anti-Theft Design】The nut of the post attachment kit is a anti-theft beveled edge design, and the bolt is one-way security bolt, which can prevent removal with ordinary tools - 【High-Quality】Made of superior metal with ZINC coated.This sign attachment kit will not rust when used in wet areas - 【Package Includes】8 PCS 2.5" Bolts, 12 PCS Anti-Theft Nuts - 【Installation】1.Tighten first nut by hand onto the back of the sign post. 2.Tighten the second nut, upside-down, on top of the first nut. The second nut locks with the first nut. 3.Insert a wrench in between the two nuts and tighten until secure. 4.After tightening, remove 2nd nut and save for removal or next install ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0BGGDR3L7 | | Brand Name | DIYIIRON | | Color | Chrome | | Customer Reviews | 4.5 4.5 out of 5 stars (126) | | Manufacturer | DIYIIRON | | Material | Metal | | Model Number | XFS170812 | | Mounting Type | Pole Mount | | Number of Pieces | 8 | | Orientation | Landscape, Portrait | | Part Number | XFS170812 | | Size | 8 PCS | ## Product Details - **Brand:** DIYIIRON - **Colour:** Chrome - **Material:** Metal - **Mounting type:** Pole Mount - **Size:** 8 PCS ## Images ![8 PCS Anti-Theft Post Attachment Kit Sign Mounting Hardware for U Channel Post, Sign Post Mounting Bolts and Nuts,2.5" Bolt - Image 1](https://m.media-amazon.com/images/I/71c-xjqcSsL.jpg) ![8 PCS Anti-Theft Post Attachment Kit Sign Mounting Hardware for U Channel Post, Sign Post Mounting Bolts and Nuts,2.5" Bolt - Image 2](https://m.media-amazon.com/images/I/51wRvhQAdrL.jpg) ![8 PCS Anti-Theft Post Attachment Kit Sign Mounting Hardware for U Channel Post, Sign Post Mounting Bolts and Nuts,2.5" Bolt - Image 3](https://m.media-amazon.com/images/I/61wu19TPzuL.jpg) ![8 PCS Anti-Theft Post Attachment Kit Sign Mounting Hardware for U Channel Post, Sign Post Mounting Bolts and Nuts,2.5" Bolt - Image 4](https://m.media-amazon.com/images/I/61Od6HvlgwL.jpg) ![8 PCS Anti-Theft Post Attachment Kit Sign Mounting Hardware for U Channel Post, Sign Post Mounting Bolts and Nuts,2.5" Bolt - Image 5](https://m.media-amazon.com/images/I/71HWlJhUs7L.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by A***N on 18 September 2023* Great set. Need to cut off end of bolt to prevent backing out by turning from thread end with wrench. ### ⭐⭐⭐⭐⭐ Review *by E***5 on 29 July 2025* Just as described and works as it should. Easy to install. ### ⭐⭐⭐⭐⭐ Review *by E***R on 18 May 2025* Excellent option for mounting street signs making it hard for some who might try to steal them. --- ## 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/498878688-8-pcs-anti-theft-post-attachment-kit-sign-mounting-hardware](https://www.desertcart.jp/products/498878688-8-pcs-anti-theft-post-attachment-kit-sign-mounting-hardware) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-05-18*