Features: 1PRE INSTALLED FOR ENGRAVE: The laser roller engraving module comes with pre installed for easy setup. This kit is plug and play and can be used to engrave cylindrical objects such as pens and cups 2FREE TO ADJUST: Ideal for most types of desktop laser engravers, where you can adjust the Z height or reposition the base to accommodate the required clearance for the rollers 3WIDE COMPATIBILITY: Support for LaserGRBL, for LightBurn, etc., suitable for most desktop laser engravers. If you're not sure about compatibility, look at the stepper motor specific wiring diagrams below and check 4ADJUSTABLE WIDTH RANGE: Laser rotary roller engraving module possess adjustable width for level 5, diameter 20mm?80mm can be used 5GASKETS WITH SCREWS: Adopt aluminum alloy gaskets and screws to combine, the overall appearance is more beautiful, very practical Package included: 4 x Aluminum Alloy Gasket M3 8 x Aluminum Alloy Gasket M4 4 x Aluminum Alloy Gasket M5 2 x 2020 Profile L200mm 4 x Flange Bearing 2 x Rotary Drum 4 x Timing Pulley Fixing Plate 1 x Motor Side Plate 1 x Side Board 1 x 20 Teeth Synchronous Wheel Inner Hole 5 2 x 20 Tooth Synchronous Wheel Inner Hole 6 1 x No. 17 Stepping Motor&nbsp 1 x Screw Nut Package 1 x Tool Kit 1 x Rubber Timing Belt 1 x Motor Wire 2 x Limit Ring 1 x Idle Gear 1 x User Manual