Glarks high quality allen hex drive flat head socket cap bolts screws assortment kitMaterial: 10.9 grade alloy steelFastener Type: Machine ScrewSize: M3 M4 M5Feature: Internal hex drive has a hexagonal slot that turns using an allen key driver to installApplication: Perfect for mechanical installation, machine parts, die fixturing.Package include:M3 X 8 ------------ 30pcsM3 X 12 ----------- 30pcsM3 X 16 ----------- 30pcsM3 X 20 ----------- 30pcsM3 Nuts ----------- 100pcsM4 X 8 ------------ 25pcsM4 X 12 ----------- 25pcsM4 X 16 ----------- 20pcsM4 X 20 ----------- 20pcsM4 Nuts ----------- 80pcsM5 X 8 ------------ 15pcsM5 X 12 ----------- 15pcsM5 X 16 ----------- 15pcsM5 X 20 ----------- 15pcsM5 Nuts ----------- 60pcsTotal Quantity: 510pcsThis set of fasteners includes several different sizes of screws and nuts that are very common size, make your life convenient