FIFTY-FIFTY XCR 1X Chain Guide High Diect-Mount 30-40t Black The high molecular nylon parts increase shock absorb, wear life, and reduce friction and noise. Full machined alloy hardware(upper cage/bashguard fixing bolts). Adjustable upper cage with chainring range indicator. Wild range chainguide angle adjust by rotation within ISCG Slot. Easy install with M6*10,12,16 bolts and chainline adjusted by 1mm and 3mm spacers.