Features: Upgraded Roller: With a support frame, the R3 PRO roller adds a support post to sculpt irregular prototype bodies such as goblet,baseball bat. The diameter can be adjusted in 8 steps, and the engraving diameter can be as small as 4mm. No installation, no adjustment, ready to use after unpacking. The roller made of One-piece rubber, hardness up to 70A and with strong friction, and when carving can fix the object, and is not limited by the length of the object. Concentric design, adjustment-free synchronising belt,and the motor is not exposed, safer. Compatible with ATOMSTACK, NEJE, Ortur,Twotrees,etc. and applicable to 95% of engraving machines on the market. Specification: Model: R3 PRO Power: 24W Dimensions: 260x90x100mm Material: Aluminum alloy, 303 stainless steel, , silicone,plastic Applicable models: Compatible with 95% of laser engraving machines on the market. Including ATOMSTACK, Ortur, NEJE, Twotresss, etc. Package Size: 28.5 x 18 x 14cm/11.2 x 7 x 5.5in Pacakge Weight: 2.05kg/4.5lb Packing List: 1 x Roller Axis of Rotation 4 x Auxiliary Heightening Columns 2 x Auxiliary Support Shaft 1 x Support Frame