The self-locking design of Snap-in parallels allows for quick and easy installation on TriMax C vise jaws with no additional tools. This allows for reduced downtimes, the elimination of clamps and locks, and increased accuracy of the finished parts. Simply snap parallels into place without bolts or clamps. Four parallel heights are available for each vise type (C38, C60, C90). All components are heat treated and precision ground for accuracy. Made from steel. Sold in pairs.