This Is the 5/16 x 24 Heavy Hub from Harry B. Higley. FEATURES: Brass construction with a hex. This carefully polished hub gives an electric starter"s rubber cup a large gripping area. Holes are predrilled for tightening purposes. INCLUDES: (1) Heavy Hub SPECS Shaft Size: 5/16-24 Weight: 2oz Diameter: 7/8" NMH 2-23-98 ir/le kr3/26/03