Socket Screw, Machine, Self Drilling Screws, Flat Head Screw, External Hex
Imperial, Metric, Fine, Metric, Coarse, Metric, Inch
1/4"-20, 1/4 in, 5/16 in, 5/16"-24, 1/4 in, 1/4"-28, 3/8"-16, 3/8 in, 5/16"-18, 5/16 in
3 7/8", 3 11/16", 85 mm, 16 mm, 100 mm
Steel, Alloy Steel, Brass, Stainless Steel, Nylon, Plastic, Titanium
Flat, Low-Profile Standard, Ultra-Low-Profile Standard, Standard, Flanged Button
Hex, Phillips, Socket, External Square, Slotted