The Sabotage Sprocket is a tribute to an old idea, based on old school sprocket/guard combos, but with new school tech and materials 5mm thick 6061-T6 alloy chainring with a high impact, low friction guard 15/16` bore with 19 and 22mm adapters included 1pc/3pc 28T 6061AL Black 1/2` x 1/8` StandardUPC/EAN/GTIN: 811120033355