Enduro Wave Washer 30mm light duty twin pack

From Enduro:

Part Type: Wave Washer - 30mm - Light Duty - Pack of 2
Size: 30mm dia /0.4mm thick (for cranks running 30mm dia axle)
Pack Size: QTY 2
Note: Ideal for using in conjunction with Angular Contact BB Bearings - if for instance you have upgraded from standard radial bearings to angular contcts, then this wave washer helps keep the bearing in the correct position.