Screw Loose Black Alloy Cap Head Kit with case, a 650 piece bulk m3 hardware kit. Perfect for multiple custom builds and maintenance for a variety of R/C trucks and cars. This Black Alloy SHCS Kit includes 150 SS nylon locknuts, 100 flat washers and 400 m3 screws. The screws include 50 pieces each of the following m3 button head lengths: 8mm, 10mm, 12mm, 14mm, 16mm, 20mm, 25mm and 30mm. All black hardware is 12.9 class black oxide alloy. The nyloc locknuts and flat washers are A-2 (18.8) stainless steel and this kit comes with a small hardware case.