Gibraltar 1/4-20, 0.31" Thread Length, 0.16" Plunger Diam, 0.19" Plunger Projection, 0.5 Lb Init to 2 Lb Final End Force, Stainless Steel Pull Ring Plunger 0.31" Len Under Head, 0.44" Body Len, 3/4" Ring Diam, 0.62" Plunger Len, 1/4" Hex, 0.18" Head Height, Locking Element