Radical retro styled, style matching the Kustom Tech rear drum brake. This mini-sized drum is made from cast iron, the best material for maximum efficiency in a drum brake. Fins in the center will aid cooling. The sides are aluminum. Compatible with all forks, except Springers. It is drilled for use with 40-spoke rims and is equipped with 3/4\" (19.05mm) inside diameter axle bearings. Approx. dimensions: 3-5/16\" (84.1mm) wide x 5-1/2\" (139.7mm) diameter. Note: See 532491 for optional 21\" stainless spokes & nipples for use with this brake drum kit in combination with a custom 21\" rim.