... M3 to M64 1/4'' to 7/8''5.class:4.8 6.8 8.86.minimum order quantity:1 2TONS7.supply ablity ... M3 to M64 1/4'' to 7/8''5.class:4.8 6.8 8.86.minimum order quantity:1 to 2TONS7. ... or black5) ISO,SGS,ROHS6) different grade :4.8 grade, 6.8 grade, 8.8 grade,12.9grade7) different material :steel, brass, stainless ... :Carbon Steel,45#,35CrMo,40Cr,42CrMo3.Grade:4.8s 5.8s 6.8s 8.8s 10.9s 12.9s4.Surface:Plain,ZP,Black, ...