This fork cup has a built in fork wtop that cleans up frame neck area for that sanitary custom look. To prevent the cup from twisting in the frame, a 3/16 inch I.D. hole is provided in the fork cup so the frame neck can be drilled by the technician. A 3/16 inch O.D. staking pin is also included. This chrome plated steel cup is designed to be used with Big Twin frames with removable fork cups. Fits with OEM style FXR or DYNA style lower fork bracket. Chrome plated.