Product Review

✔ Screw Head Style: Socket Cap; Screw Drive Style: Internal Hex, known as Hex-socket drives; Fully Threaded
✔ Thread Dia. : 4mm, Thread Pitch : 0.7mm, Head Diameter : 7.20mm/0.28",Head Height : 4.0mm/0.16"
✔ Thread Length :20mm/0.79", 25mm/0.98", 30mm/1.18", 35mm/1.38", 40mm/1.57"
✔ Stainless steel 304, high strength and anti-corrosion in various environments
✔ These screws come in an easy-use separated girds storage box

***Length Information***
---Item---------------Thread Length----------------Total Length
M4 x20mm-----------20mm/0.79"---------------------24mm/0.94"
M4 x25mm-----------25mm/0.98"---------------------29mm/1.14"
M4 x30mm-----------30mm/1.18"---------------------34mm/1.34"
M4 x35mm-----------35mm/1.38"---------------------39mm/1.54"
M4 x40mm-----------40mm/1.57"---------------------44mm/1.73"

***Package Quantity***
M4 x 20mm-------------------10 Pcs
M4 x 25mm-------------------10 Pcs
M4 x 30mm-------------------10 Pcs
M4 x 35mm-------------------10 Pcs
M4 x 40mm-------------------10 Pcs
Total---------------------------50 Pcs


***About Internal Hex Drives***
Internal hex drives, also known as hex-socket drives, are similar to hex drives, but have a hexagonal hole in the center that requires an Allen key, also known as a hex key or Allen wrench.
***About Socket Cap Screws***
Socket cap screws, also known as Allen head screws, 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.