Stud Link Anchor Chains 1.Grade U2 and U3 stud and stud-less link anchor chains 2.size 12.5mm to 152mm. Stud Link Anchor ChainsMooring chains ORQ,R3,R3s and R4 with diameters ranging from 12.5mm to 152mm. Following certificates can be supplied: CCS, LR, GL, ABS, DNV, BV,RS,RINA,KR.etc. Accessories can be supplied such as kenter shackles, swivels, anchor shackle D type, etc.