Pivot Point Bow Tie Locking Cotter Pin Kit 80 piece kit contains 7 different Bow-Tie Cotters that fit shafts from 3/16" to 3/4" diameter. Push or pull the cotter leg into hole, the Bow-Tie snaps into a zero-tension locked position. It is easily released by lifting the loop and sliding off, but reduces the risk of being accidentally knocked or vibrated off, as with hair pin cotters.