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 50 Chain Number 1 Strand 23 Teeth Without Hardened Teeth B Sprocket Style DESCRIPTION Maximum bores shown will accommodate standard keyseat and setscrew over keyseat. Slightly larger bores are possible with no keyseat, shallow keyseat, or setscrew at an angle to keyseat. FEATURES 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 PITCH DIAMETER [MIN] 4.590 in BORE TYPE Reborable LENGTH THROUGH BORE 1 in CHAIN NO. 50 KEYWAY No Keyway or Setscrew PITCH DIAMETER 4.590 in INCH/METRIC Inch CHAIN PITCH 5/8 in BORE STYLE Minimum Bore SPROCKET STYLE B CALIPER DIAMETER 4.18 in NO. OF STRANDS ACROSS 1 MATERIAL Steel OUTSIDE DIA. 4.9200 in NO. OF TEETH 23 OUTSIDE DIA. [MIN] 4.9200 in WIDTH ACROSS TEETH 0.34 in HARDENED TEETH Without Hardened Teeth MARTIN NO. 50B23 HUB LENGTH THRU 0.657 in BORE RANGE [MIN] 3/4 in BORE RANGE [MAX] 2 in HUB DIA. 3 in SERIES B CONSTRUCTION Solid WEIGHT 2.66 LB EAN OR UPC 697950011950