These mounts are great when used with scopes flashlights lasers etc. Accessories are mounted at a 45 degree angle. When used with scopes the iron sights remain visible. Made from aircraft quality aluminum and Hardcoat Anodized matte black to Military Specifications or better. Uses a 7/64 Allen wrench. - Specifications - Made from aircraft quality aluminum - Hardcoat Anodized matte black to Military Specifications or better - Length: 1-3/16 long - Weight: 1.152 Oz.