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✔ Meets/exceeds: ANSIB18.3BT, UNC threads ✔ Stainless steel 304, high strength and anti-corrosion in various environments ✔ Screw head style: button; screw drive style: hex socket, known as internal hex drives ✔ These screws come in an easy-use separated girds storage case Item----------------Head Dia.----------Head Height---------Thread Length-------Total Length 1/4-20 x 3/8"-------------7/16"--------------1/8"-----------------3/8"--------------- 1/2" 1/4-20 x 1/2"-------------7/16"--------------1/8"-----------------1/2"--------------- 5/8" 1/4-20 x 5/8"-------------7/16"--------------1/8"-----------------5/8"--------------- 3/4" 1/4-20 x 3/4"-------------7/16"--------------1/8"-----------------3/4"--------------- 7/8" 1/4-20 x 1"---------------7/16"--------------1/8"-----------------1"---------------- 1-1/8" Package Contains: 1/4-20 x 3/8"--------------10 Pcs 1/4-20 x 1/2"--------------10 Pcs 1/4-20 x 5/8"--------------10 Pcs 1/4-20 x 3/4"--------------10 Pcs 1/4-20 x 1"----------------10 Pcs Total: 50 Pcs About Hex Socket Drives Hex socket drives, also known as internal hex drives, have a hexagonal hole in the center that requires an Allen key, also known as a hex key or Allen wrench About Button Head Button head screws are similar to standard pan head screws but have a curved top