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"

SPECIFICATIONS

-Made from aircraft quality aluminum 

-Hardcoat Anodized matte black to Military specifications or better. 

-3/4" long.

Link to parts manufacturer