can be used with Ac 220 V country?

No, it can 't be used with AC 220v country.

Does it rotate or vibrate?

Glad to help you, the engraver work by reciprocating motion, the rotary tool works by rotational motion.

I can't secure the screw when the engraving is inserted, what am I doing wrong?

If you mean you can't secure the set screw when the "engraving tip" is inserted, consider the following. The tip should be sticking out about 3/8" to 7/16" if it's properly inserted. If it's sticking out more, it's not in, and you should back out the set screw a little more so the tip will go all the way in and seat in the holder. Make sure you use the Alan wrench that came with the engraver to tighten the set screw. If it still won't tighten, you may have a defective unit (engraving tip holder, set screw, set screw threads, etc) and you should go to the manufacturer's website for their contact information and see if they will help you. If you just purchased it, consider Amazon returns if the unit turns out to be defective and should be replaced.

How is this compared to Dremel 290-05 120V? What type of bits recommended for granite/marble?

According to the feedback from other buyers, Utool Engraver have more beautiful appearance and powerful performance. And the Tungsten Carbide Steel Bits can be used on the granite/marble

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10PCS Spare Parts Set for UTOOL 24W Engraver Pen Kit

Product ID: 172556280

Details

Shank Type
Straight
Brand
UTOOL
Item dimensions L x W x H
3.5 x 5 x 0.1
Tool Flute Type
Straight
Surface Recommendation
Glass Ceramic

💎4 Diamond Bits for ultra-smooth engraving

🔧Allen wrench + chuck screw for quick swaps

⚙️4 Tungsten Carbide Bits, HRA≥80 hardness

¥3994

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔩 Elevate your engraving game—because precision waits for no one!

BUILT TO LAST PERFORM - High wear resistance and strength guarantee long tool life, so your creativity never hits pause.
PRECISION CARBIDE POWER - Ultra-fine grain tungsten carbide bits deliver unmatched hardness (HRA≥80) for flawless engraving.
SWIFT ACCESSORY CHANGES - Includes M2 Allen wrench and chuck screw for effortless bit installation and removal—maximize your workflow.
DIAMOND GRADE SMOOTHNESS - Diamond bits ensure silky, coherent shallow cuts on diverse materials—stand out with every detail.
VERSATILE MATERIAL MASTERY - Perfect for stone, glass, metal, hardwood, tile, ceramics, marble, granite—one set to rule all surfaces.

This 10-piece spare parts set for the UTOOL 24W Engraver Pen Kit includes 4 ultra-hard tungsten carbide bits, 4 diamond bits for smooth engraving, plus an Allen wrench and chuck screw for quick accessory swaps. Designed for high durability and versatile use on hard materials like stone, glass, and metal, it ensures professional-grade performance and long-lasting reliability.

Specifications

ASIN	B07YWH1Y5J
Best Sellers Rank	#13,004 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #18 in Jewelry Making Engraving Machines & Tools #1,531 in Craft Cutting Tools
Customer Reviews	4.5 4.5 out of 5 stars (281)
Date First Available	July 15, 2020
Item Weight	3.52 ounces
Item model number	PEB0101
Manufacturer	UTOOL
Product Dimensions	3.5 x 5 x 0.1 inches

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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