The Demolition Spline Drive Sprocket is CNC machined from 6 mm thick, 7075 aluminium. With splined insert: Hardened steel insert, keyed for 19mm/ 48-splined spindles. As it has the insert with the splines, you don't need the bolt that is needed with most sprockets. You also do not have to worry about the bolt coming loose and getting that wobble or rattle noise.
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