This Post is for a Used Gates 8M‑60S‑21 Poly Chain GT2 Sprocket 
Specifications:

Brand
Gates

Model
8M -60S-21

Type
  Poly Chain Sprocket

Size/Details
Inner Diameter: 2.70"
Outer Diameter: 6.50" 
Width:  1.18"
Max RPM: 4240

This listing is exactly as pictured and fully guaranteed.