"Material: Steel as per QQ-S-634-1020; Finish: Cadmium plate, Type 1, Class 1, according to QQ-P-416 specifications. Overall dimensions: 2.375 OD x 1.437 LG. Four holes with a diameter of .265 and a counterbore of .438 depth and .25, equally spaced. Four slots with a diameter of .312 and length of 1.062."