Allen Hex Drive Size: 3/16" Thread Size: 5/16-18; Thread Pitch: 18 TPI Coarse Thread (UNC); Thread Style: Right Hand; Thread Coverage: Full Machine Thread Exterior Finish: Bright Finish; Color: Silver Tone; Quantity: 50 pack HIGH QUALITY MATERIAL: 100% Stainless steel 304(18-8) which is superior to regular steel and any zinc plated fasteners, provides good strength and corrosion resistance in bad environments. Screw Length: (measuered from under the head) 1-1/2" or 1.5 inch; Head Height: 0.166 inch; Diameter of the head: 0.547 inch Approximately