Soft jaws allow for forming of jaws and subsequent clamping of molded parts which must not have clamping marks on the workpiece surface. Steel jaws are case hardenable for the jaws to be hardened for longevity after machining.
These are parallels and risers for use with OK-Vise RM Multi-Rail. They come in a range of sizes and either mount to the rail with a t-nut or attach to the clamps and stops using magnets. Serrated risers are also available.