Features:OOTDTY   brand new and high qualityPut the needle wheel on the handle first (do not tighten the screw first).Install it on the machine and adjust the tightness of the pressing needle.After adjusting the needle, fix the screw with a wrench.It fits most tattoo machine.Of course,some can Not be used.Please read its size description in detail before purchasing.Specifications: Material: Metal and plasticColor: BlackSize:app. As picture shownQuantity: 1 setPackage Includes: 1set x External Needle Pressing Wheel(other accessories demo in the picture is not included.)Note: Transition: 1cm=10mm=0.39inchNo retail package.Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!