This front binding post can be used on all tattoo machine and is made of Copper. Contact screw center point: When this is mounted to any machine with washer connected. The distance from the frame to the contact screw center is 1 cm from the frame. Items Included: -Front Binding Post- -Contact Screw Stopper- -Screw- -(2) Plastic Washers- -(2) Metal Washers-