Square Head Set Screws Socket Head Cap Screw Head Type Not Applicable Point Type Cup Number of Pieces 60 System of Measurement Inch Thread Size 1/2 In.-13 1/4 In.-20 3/8 In.-16 5/16 In.-18 Screw Size 1/4 in 5/16 in 3/8 in 1/2 in Overall Length 3/4 in 1 in 1 1/4 in Number of Sizes 6 Drive Type External Square Material Steel Finish Black Oxide Thread Locking No Pack Size Small Pack Special Features Not Applicable Container Material Plastic Dimensional Standards ASME/ANSI