Rotary Shaft 80 Easy to Operate / Stable Performance / Beautiful Appearance Mainly Used in Laser Marking Machine, Laser Welding Machine, Laser Engraving Machine. You Can Also Mark: Cigarette Holder, Pen, Bearings, Small Hardware, Etc. Basic Information Dimensions: Chuck Size 80m M Positioning Accuracy: 0.2 Drive Mode: Stepping Function: Marking Universal.