These aluminum inserts protect the anodized finish on your AN style hose fittings during assembly. A magnetic insert on the back holds them to the steel jaws on your vise. The full-length horizontal pocket is ideal for holding hose in place, making straight cuts fast and simple. Jaws measure 4" long but can be used in just about any size vise. Sold in pairs (enough for both jaws of one vise). Color may vary.