Features: & 9654; Engraving Size: Cylinder diameter 4-138mm, can be adjusted in 4 levels. No installation, no adjustment, ready to use after unpacking. & 9654; Easy to Operate: ACMER rotary module has four different angles for easy cylinder adjustment, loosen the two knurled screws on both sides to operate, no screwdriver is required, provide a bracket for easy engraving. & 9654; Premium Quality: The roller made of One-piece rubber, hardness up to 60A and with 70A strong friction, and when carving can fix the object, and is not limited by the length of the object. & 9654; Strong Compatibility: Compatible with TEVOUP/XTOOL/ATOMSTACK/NEJE/Ortur/SCULPFUN/Twotrees, etc. and applicable to 95% of engraving machines on the market. & 9654; Equipped with 8 Raised Feet: 4 raised feet to facilitate raising the laser engraving machine to perfectly fit the rotation axis. Specifications: Model: ACMER-M1 Size: 246x165x46mm Weight: 1kg Material: Aluminum alloy, 303 stainless steel, iron, silica gel, plastic Object Engraving Diameter: 4mm≤D≤138mm Hardness: 60A Friction Force: 70A Package Size: 295x185x80mm/11.6x8.2x3.1in Package Weight: 1100kg/38.8oz Package List: 1 x Roller Axis of Rotation 8 x Raised Feet