This front binding post can be used on all tattoo machines and is made of brass and contact screw is steel. 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. Items Included: -Front Binding Post- -Contact Screw Stopper- -Screw- -(2) Plastic Washers- -(2) Metal Washers-