Items Description Product details: 1.Standard hexagon Standard size, uniform force,located in the center of the head with no offset, not easy to slip. 2.Obvious threads Uniform pitch, obvious screw thread,no residual burrs, the set screw threads will be able to get a good grip. 3.Come in many different sizes The size of the screw is difficult to measure without professional tools,and the range of sizes of screws and other fasteners is exhaustive , many of them very small of unknown gauges, thread pitch, etc. Getting the set screw kit you'll get a few other boxes of assorted screws so you can always have the right size of that kind of thing. There are 50pcs high quality hex socket cup point grub screw Material: 304 (A2-70) stainless steel / 12.9 grade steel Size : d(thread diameter) x L(total length) Metric thread diameter: M2 (2mm) / M2.5 (2.5mm) / M3 (3mm) M3.5 (3.5mm) / M4 (4mm) / M5 (5mm) / M6 (6mm) Metric thread pitch: 0.4mm(M2) / 0.45mm(M2.5) / 0.5mm(M3) 0.6mm(M3.5) / 0.7mm(M4) / 0.8mm(M5) / 1mm(M6) Thread length: 2mm-25mm