SUMO GUARD SPROCKET - Features: Our proven Thermalite material guard will protect your SUMO sprocket. The thick design will have you sliding and grinding for a long time to come. - Bore: 15/16"-24mm. - Thickness: Sprocket: 6.0mm, Guard: 7.75mm. - Adapters: For 22mm & 19mm spindles included. - Sizes: 25T. - Colors: Anodized Black, or Polished sprocket, W/ Black guard. - Weight: 5.1oz.