Also called a “double nut blind type” rivet. For attaching handle slabs to the tang of a full tanged knife. Small size has 6X32 thread ¾” long shank with two nuts 3/16” diameter and 3/8” long. Works for either side of the handle slab. Sold in pairs. Remember to state correct size when ordering. SOLD ONLY IN 3/16" AND 1/4".