This MT071 Lower 1/3 Base Mount for Aimpoint T1/H1 Tactical Red Dot Sights features a machined recoil lug for consistent, repeatable mounting. Compatible with Aimpoint T1 / H1 Series optics. Made from 6061 T6 aluminum black anodized with Machined recoil lug. Style 1/3 lower base mount. Compatible with Aimpoint T1 / H1 Series optics.