Product: Belt Grinder Wheel Set Knife Grinder 2x72" 5/8 Bore (15,90MM) 4" Diameter Crowned Drive Wheel 6061 Aluminum
Brand: Dog River Tools
Complete 4 Piece Set   5/8” Bore Two 2" diameter precision turned aluminum idler wheels  One 3" diameter precision turned aluminum tracking wheel with sealed bearings One 4" diameter precision turned aluminum drive wheel Works well with all professionally 2x72" belt grinders 
Manufactured with 6061 Aluminum, The drive wheel is 5/8 bore with the keyway broached all the way through. Bore of the bearings is 1/2" so you can use any 1/2" diameter bolt as an axle
Two Qty - 2" diameter precision turned aluminum idler wheels with sealed bearings, 2-1/4" wide
One Qty - 3" diameter precision turned aluminum tracking wheel with sealed bearings. The tracking wheel is 2-1/4" wide, 3" in diameter & crowned
One Qty - 4" diameter precision turned aluminum drive wheel. The drive wheel is 4" in diameter & crowned to ensure accurate belt tracking. The drive wheel is 2-1/4". The set screw (included) is 1/4-20 & 1/2" long
Works well on any professionally 2x72" belt grinder. The wheels are 2-1/4" face width to comfortably accept any commercial 2" wide grinding belt

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