The Yost Vises MP-365 6-1/2" magnetic aluminum prism vise caps attach to and cover a set of 6-1/2"-wide serrated vise jaws to shield delicate work from damage and enable clamping of pipe for cutting, drilling, and tapping. The caps are made of aluminum for durability. They have a prism pattern made from one vertical groove, three horizontal grooves, and one center punch groove to enhance grip of pipe and delicate items and to prevent marring. The magnetic backing runs the full length of the cap to securely bond it to the front of the vise jaw. Two jaw caps are included.

Yost Vises manufactures a wide range of vises, including bench-mount, woodworking, and drill-press styles. The company, founded in 1908, is headquartered in Holland, MI.