1" High Extension Riser Picatinny/Weaver Mount for dot sight and scope, TufForce MT-1R7E15 Tufforce Extend / Riser mount, 1" profile, overall 21 slots, 11"/ 225mm in length Extension length is 6"/ 155 mmBase length is 3" / 75mm with two nuts distance of 60mm CNC machining, Premium Aircraft Aluminum Premium Aircraft Aluminum, 6061-T6, Hard-coat Anodized Finish, Black