Description: Name: Crank Washer Material: stainless steel/aluminum alloy Packing size: 60x40x40mm Gross weight: 15g a pack Applicable specifications: 24MM/29MM/30MM crank Please pay attention to your crank specifications beforebr/> Features: 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 centralof the bottom bracket, and the chainring will swing, skip the chain, andinaccurately, which will affect the riding safety. Packing list: 5pcs/bag x Crank Washer (mixed) Note: Lightand different displays may cause the color of the item in the picture a little different from the real thing. Manual measuring,please allow 1~3mm error,thank you. --after installing the crank washer, the crankcan be stabilized without shaking from side to side --stabilize the fit between the cassette and bottom bracket and crank. Ensure the normalof 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. --packing size: 60x40x40mm