From old stock. Had some rust and staining and I cleaned it up a bit. Has never been on a machine. Buyer will receive the sprocket shown. Tolerances meet or exceed ANSI standards Manufactured of high carbon steel Precise machining and processes ensure consistent finish and high quality Bores are concentric to pitch line, minimizing run out SPECIFICATIONS Bore Diameter 0.7500 in - 3/4 in Bore Type Reboreable, Reboreable CAD Drawing Click here Caliper Diameter 3.5953 in Chain / Sprocket Type Standard ANSI Roller Chain Number Pitch 50 / 5/8 in Hardened Teeth Non-Hardened Teeth Hub Diameter 3.0000 in Hub Style B, B Hub Type B Length Through Bore 1.0000 in Manufacturer Catalog Click here Manufacturer Upc Number 697950011516 Material Steel Maximum Bore Diameter 2 in Number Of Hubs 1, 1 Number Of Strands Across 1 Number Of Teeth 20 Outside Diameter 4.3210 in Pitch Diameter 3.9953 in Pitch Type Single Storage Dimension Height 1.0625 in Storage Dimension Length 4.625 in Storage Dimension Width 4.625 in Surface Treatment Protective Coating Tooth Width 0.343 in Weight 2.28 lbs Product Type Stock Bore Sprockets Bore Diameter 0.7500 in Hub Type B Material Steel Number Of Strands Across 1 Number Of Teeth 20 Outside Diameter 4.3210 in, 4.3210 in Standards Met ANSI