Specifications: – Made from aircraft quality aluminum – Hardcoat Anodized matte black to – Military Specifications or better – Dims: 1-1/4 L x 1/2 H. – These risers meet mil. spec 1913 and use a larger screw for more clamping power. They fit any picatinny rail. Great for elevating scopes sights flashlights etc. These risers elevate your accessories 1/2