... copper, provided reasonable price 2.Certificate:ISO9001, RoHS, CE 3.OEM and ODM 4.A.W.G.:12/10 Kaisen ... !!The following is showed in detail about this product:SNB5.5-3.5 for #6 screw, 12-10 gauges, B8.3mm, L19. ... L19.5mm, F7.5mm, E6.8mm, D5.6mm, d3.4mmSNB5.5-5 for #10 screw, 12-10 gauges, B9.0mm, L19.5mm ... L25.5mm, F12mm, E6.8mm, D5.6mm, d3.4mmSNB5.5-8 for 5/16 screw, 12-10 gauges, B14.0mm, L24.5mm ...