Product Review

Head Diameter : 5.5 mm / 0.22", Head Height: 1.7mm /0.07"; Thread Size(Diameter ): 3 mm; Thread Pitch :0.5 mm
Screw Head Style: Button ; Screw Drive Style: Internal Hex, known as Hex-socket drives; Fully Threaded
Alloy Steel, Black Oxide Finish, 10.9 Grade Tensile Strength
These Screws Comes in an Easy-use Storage Case
***Length Information***
---Item---------------Thread Length------------Total Length
M3 x20mm-----------20mm---------------------21.6mm
M3 x25mm-----------25mm---------------------26.6mm
M3 x30mm-----------30mm---------------------31.6mm
M3 x35mm-----------35mm---------------------36.6mm
M3 x40mm-----------40mm---------------------41.6mm
***Package Quantity***
M3 x20mm-----------20Pcs
M3 x25mm-----------20Pcs
M3 x30mm-----------20Pcs
M3 x35mm-----------20Pcs
M3 x40mm-----------20Pcs
Total------------------100Pcs

***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 Button Head***
Button head screws are similar to standard pan head screws but have a curved top