✔ Meets/Exceeds: ASME 18.3-12.9
✔ Screw Head : Socket Cap ; Screw Drive: Hex Socket
✔ 12.9 Alloy Steel,Min. Tensile Strength 176,900 psi
✔ Easy to store: These screws come in an easy-use storage case

[ Sizes ]---------[ Head Height ]-----[ Thread Length ]------[ Total Length ]
#8-32 x 3/8"--------0.164"-----------------3/8"----------------0.54"
#8-32 x 1/2"--------0.164"-----------------1/2"----------------0.66"
#8-32 x 5/8"--------0.164"-----------------5/8"----------------0.78"
#8-32 x 3/4"--------0.164"-----------------3/4"----------------0.91"
#8-32 x 1"----------0.164"------------------1"------------------1.16"

[ Package Contains: ]
#8-32 x 3/8"--------20 Pcs
#8-32 x 1/2"--------20 Pcs
#8-32 x 5/8"--------20 Pcs
#8-32 x 3/4"--------20 Pcs
#8-32 x 1"----------20 Pcs
Total-------------100 Pcs

About Hex Socket Drive
Hex Socket Drive, also known as Internal Hex Drive, 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 Head , 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