Made of 6061 alloy and stainless steel, lockmounts are a very secure option for safe rifle storage. A big 5/16" diameter wood lag and #10 wood screw fasten lockmounts to wood studs or swap a bolt in for metal applications. Lockmounts are spring loaded for rapid gun access and are reliable. There are 3 sizes small, medium and large. Lockmounts are sold in pairs, and are keyed alike in pairs. Special order to get all your lockmounts keyed alike.