Coil Pins are pins that are manufactured by roll forming metal strips into a spiral cross section of 2 1/4 coils. Coiled spring pins have a body diameter larger than the hole diameter and chamfers on both ends to facilitate starting the pin into the hole, the spring action of the pin allows it to compress as it assumes the diameter of the hole. Zero Products Inc. can manufacture any SIZE with any type THREAD in any MATERIAL and COATINGS you need.