This front binding post can be used on all tattoo machines. This front binding post is made of brass. It also has a twist lock that will make your contact screw secure. 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 1.1 cm. Items Included: -Front Binding Post- -Twist Contact Screw Lock- -Screw- -(2) Plastic Washers- -(2) Metal Washers-