????olts: Standard: ASTM A307 DIN BS Diameter: 1/4??1/2?? M6-M24 1/4??1/2??Length: 1??10?? 50-300mm 1??10??1.DIN: GR4.8 GR8.8 2.ANSI: GR2 GR5 Finish: PL ZP HDG BLk