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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UTOOL Engraver Pen with Letter/Number Stencil, 24W Handheld Etching Tool for Wood Metal Glass Engraving with 4 Replaceable Tungsten Carbide Steel Bits

UTOOL Engraver Pen with Letter/Number Stencil, 24W Handheld Etching Tool for Wood Metal Glass Engraving with 4 Replaceable Tungsten Carbide Steel Bits

Product ID: 86076057

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Details

Brand
UTOOL
Item dimensions L x W x H
22.24 x 19.09
Tool Flute Type
Straight
Point Style
Taper Point
Surface Recommendation
Ceramic Glass

⚡24W high power motor

🎨5 adjustable depth settings

🔩4 tungsten carbide bits

Description

✍️ Etch your mark with power and precision — don’t just create, captivate!

DURABLE TUNGSTEN TIPS - 4 replaceable carbide bits ensure long-lasting, smooth performance
PRECISION MEETS POWER - 24W motor delivers 7200 strokes/min for flawless engraving every time
ERGONOMIC COMFORT GRIP - Soft rubber handle reduces hand fatigue for extended creative sessions
CUSTOMIZABLE DEPTH CONTROL - 5 variable depth settings let you craft intricate designs with ease
VERSATILE MATERIAL COMPATIBILITY - Perfectly etch wood, metal, glass, leather, and more with one tool

The UTOOL Engraver Pen is a professional-grade handheld etching tool featuring a powerful 24W motor and 7200 strokes per minute for efficient engraving on wood, metal, glass, and leather. It includes 4 replaceable tungsten carbide bits and 5 adjustable depth settings for precision control, all wrapped in an ergonomic rubber grip to minimize hand fatigue. Ideal for DIYers and creatives seeking durable, versatile performance backed by a 1-year warranty.

Specifications

Brand	UTOOL
Item dimensions L x W x H	22.24 x 19.09 x 2.2 inches
Tool Flute Type	Straight
Point Style	Taper Point
Surface Recommendation	Ceramic, Glass, Leather, Metal
Number of Flutes	2
UPC	734009710522
Unit Count	1 Count
Global Trade Identification Number	00734009710522
Manufacturer	UTOOL
Part Number	UTPE00101
Item Weight	15.7 ounces
Product Dimensions	22.24 x 19.09 x 2.2 inches
Item model number	UTPE00101
Is Discontinued By Manufacturer	No
Size	1 Pen + 4 Bits + 3 Stencils
Voltage	120 Volts
Wattage	24 watts
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No