✔ These screws meet/exceed: ANSI/ASME B18.3SH
✔ Screw Head: Socket Cap; Screw Drive: Hex Socket , Known as Internal Hex Drives
✔ Stainless steel 304, high strength and anti-corrosion in various environments
✔ Easy to store: these screws come in an easy-use separated girds storage case

[ Sizes ]-----------------[ Head Dia. ]---[ Head Height ]---[ Thread Length ]------[ Total Length ]
1/4-20UNC x 3/8"--------3/8"---------------1/4"-------------3/8"--------------------5/8"
1/4-20UNC x 1/2"--------3/8"---------------1/4"-------------1/2"--------------------3/4"
1/4-20UNC x 5/8"--------3/8"---------------1/4"-------------5/8"--------------------7/8"
1/4-20UNC x 3/4"--------3/8"---------------1/4"-------------3/4"---------------------1"
1/4-20UNC x 1"----------3/8"---------------1/4"-------------1"----------------------1-1/4"

Package Contains:
1/4-20UNC x 3/8"-----------10 Pcs
1/4-20UNC x 1/2"-----------10 Pcs
1/4-20UNC x 5/8"-----------10 Pcs
1/4-20UNC x 3/4"-----------10 Pcs
1/4-20UNC x 1"-------------10 Pcs
Total-------------------------50 Pcs
[ About Internal Hex drives ]
Internal Hex drives, also known as Hex Socket Drives, have a hexagonal hole in the center that requires an Allen key, also known as a hex key or Allen Wrench
[ About Socket Cap ]
Head Socket cap, also known as Allen head, have a recessed drive, and are commonly used when there is not enough clearance for a conventional wrench or socket. They are fastened with an Allen wrench, which is also called a hex wrench or hex key