Product Info Prevents side-to-side play in thru-spindle bottom brackets to ensure bearings do not wear out prematurely Replaces stock plastic preload rings on bikes with SRAM 30mm spindle cranks, Race Face 30mm spindle cranks, Easton 30mm spindle cranks, and SRAM DUB 28.99 spindles Super durable, Precision CNC Machined 7075 piece of hardware