BMX chainring with integrated guard mountingHigh-impact, low-friction plastic guard paired with a solid 5mm alloy sprocket by 4 boltsShadow Conspiracy Supreme and Interlock chains fit easily between the guard and sprocket15/16` bore with 19mm and 22mm adaptor Replacement guards sold separately 1pc/3pc25T6061ALCrimson Red1/2` x 1/8`StandardUPC/EAN/GTIN: 810034521217