SRAM PF 30 BB Shield & Wave Washer Kit When installing a pair of SRAM PF30 cranks into a SRAM bottom bracket, you need two shield washers to keep dust and grit out of the bottom bracket bearings and a single wave washer to help preload the crankset to ensure a proper fit. Both the two shield washers and wave washer that are needed are available in this single kit. Features Kit comes with: Two shields and one wave washer SRAM Part Number #:11. 6415. 007. 030UPC:710845689031 | Sram | Pf 30 Bb Shield & Wave Washer Kit Shield & Wave Washer Kit 11. 6415. 007. 030