Having an assortment of small metric hardware is almost an essential these days. This M3 Standoff Kit includes 340 A2-70 Stainless Steel M3 screws and nuts in a handy carrying case. There are 7 different lengths of screw ranging from 5mm to 20mm. All screws are a pan head with a hex / allen drive. The nuts are 6mm diameter and 2.3mm thick.