Stylish Snap Spiders, with 104mm bcd 4 bolt design. Fits standard three piece cranks... makes changing rings a Snap!! Uses standard 104mm bcd 4 bolt chain rings and can be reversed to help with chain alignment. Comes standard with 19mm spindle hole. Precision CNC machined with precise tolerances for better fit and strength. Made from 1/4" thick Aluminum 6061-T651 plate and certified Made in the USA. Color: Raw Finish. Weight: 1.75 oz.