... 6mm 8mm10mm13mm 3)various certificates We have sepcializd in chain producing lifting link chain more than20 years.1)material:alloy steel(20Mn2 ... )2)size:6mm 8mm 10mm 13mm3)safety factor:4:14) ... in the fierce competition.Our main products includes: hook series, chain series, link series, ring series, shackle series, turnbuckle series, ...