The Crupi alloy chain ring bolts includes short and long backings to provide a perfect fit with any spider/sprocket combination.

SPECS:MATERIAL: Alloy (aluminum)USE: Works with most 4-bolt and 5-bolt chain rings.SIZE: includes short and long backing to fit any chain ring/spider combination.
INCLUDES: 15 piece set (5 fronts, 5 short backs and 5 long backs)NOTE: To successfully use alloy bolts make sure you apply grease to the threads before tightening down. It is not recommended to use alloy bolts for riders over 120lbs. Chromoly bolts are suggested for riders over 120lbs especially when using a 4-bolt spider.