Hog Saddle Optics Pad for J-Clamp Black. This is a urethane pad that mounts between the base of the J-Clamp and an optic. The pad protects the optic and prevents the optic from twisting or rotating while mounted to a picatinny or arca rail. Comes with 1/4-20 stainless steel black oxide coated mounting bolt. Specifications for Hog Saddle Optics Pad for J-Clamp: Manufacturer: Hog Saddle Color: Black Size: One Size Package Contents: Hog Saddle Optics Pad for J-Clamp Hog Saddle JC-Optic: Optics Pad for J-Clamp Black