From old stock. Has some rust and staining. Has never been on a machine. Buyer will receive the sprocket shown. In original box as shown. SPECIFICATIONS HUB RECESS DEPTH 0.13 in HUB OD @ RECESS 1 1/2 in BORE TYPE Minimum Plain Bore NO. OF TEETH 11 INCH/METRIC Inch HUB RECESS WIDTH 1/4 in WIDTH ACROSS TEETH 0.34 in HARDENED TEETH Without Hardened Teeth OUTSIDE DIA. [MIN] 2 1/2 in KEYWAY No Keyway or Setscrew BORE RANGE [MIN] 5/8 in BORE STYLE Minimum Bore HUB LENGTH THRU 0.657 in HUB DIA. 1 3/4 in PITCH DIAMETER [MIN] 2.220 in CHAIN PITCH 0.625 in OUTSIDE DIA. 2 1/2 in NO. OF STRANDS ACROSS 1 STOCK BORE SIZE 5/8 in CALIPER DIAMETER 1.8 in CONSTRUCTION Solid CHAIN NO. 50 MATERIAL Steel LENGTH THROUGH BORE 1 in MARTIN NO. 50B11 BORE RANGE [MAX] 1 in SERIES B PITCH DIAMETER 2.220 in SPROCKET STYLE B WEIGHT 0.64 LB EAN OR UPC 697950009926