The Master Lock No. 71SC8 Shackle Collar features rivets for attaching to shackle and fits 1/4in (6mm) diameter shackles and smaller. Designed for Master Lock Nos. 22 and 22LF, 410, 411, 6830, 6831, 6835, 7030 & 7031 padlocks and American Lock Nos. S1100/A1100 series padlocks.