DescriptionSpecificationsDescription5/16-18, 0.53" Thread Length, 0.154" Max Plunger Diam, 1 Lb Init to 6 Lb Final End Force, Locking Knob Handle Plunger Countersunk Knob, 3/16" Plunger ProjectionSpecificationsManufacturer Item No.HDLS-2-PT-GManufacturer NameGibraltar