Pull out the 4-pin wire on X axis stepper motor of Engraver. Then insert the wire on stepper motor of Rotate Engraving Module. Place Rotate Engraving Module under the laser module and start to engrave. Turns your Laser Engraver to a rotating engraving machine, perfect for engraving cylinder objects, cans, pens, balls and other engravable columns. This l laser engraving machine rotary attachment supports 360 engraving of cylinders, breaking through the limitations of flat engraving patterns. It can engraving the round items or goblet. width choose can be 3mm-200mm. all-metal structures and anti-skid rubber are designed to increase friction, making the engraving process more accurate and stable. Colour:black Material:Metal+Plastic Package Contents: 1 x rotary roller 1 x wine glass holder 3 x stepper motor adapter cable 1 x 2mm wrench 1 x English user manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.