Gibraltar 1/4-20, 0.8" Thread Length, 0.155" Plunger Diam, 1/4" Plunger Projection, 1 Lb Init to 2.5 Lb Final End Force, Stainless Steel Locking Pull Ring Plunger 0.8" Len Under Head, 1.14" Body Len, 0.62" Ring Diam, 1.14" Plunger Len, 0.34" Head Height, Locking Element