100% Band new and high quality.High Wear-resistant and excellent durability.The Hollow Chainring Crank Washer Is Generally Used After The Bottom Bracket Is Installed On The Bicycle After The Modification/Upgrade.The Length Of The Crankshaft Of The Chainring Is Greater Than The Length Of The Central Axis Of The Bottom Bracket, And The Chainring Will Swing, Skip The Chain, And Shift Inaccurately, Which Will Affect The Riding Safety.After Installing The Crank Washer, The Crank Ring Can Be Stabilized Without Shaking From Side To Side Stabilize The Fit Between The Cassette And Bottom Bracket And Crank. Ensure The Normal Operation Of The Flywheel.When Installing, Be Sure To Measure The Excess Size Of The Crankshaft, It Is Recommended To Use a Caliper To Measure. Washers Can Only Be Installed On One Side Of The Disc For a Snug Fit, Mostly On The Right Side.Size: 38.5X31.5MMApplicable: 30mm CrankColour: BlackMaterial: steelPackage Contents:30 x Crankset WasherOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.