Check the listing for details. Belt Grinder Tracking Wheel for 2x72" knife making grinder with bolt axle. Condition: New. Listed at 35.85 USD. BEWARE OF WHEELS WHICH HAVE DISHED SIDES: SUCH WHEELS CANNOT BE REVERSED FROM TIME TO TIME TO PREVENT UNEVEN WEAR, ESPECIALLY ON THE TRACKING & DRIVE WHEELS. THEY ALSO USE SHORTER, LESS STABLE AXLES. Precision cnc aircraft aluminum tracking wheel for 2x72" belt grinder. The wheel is 3" in diameter & crowned to ensure accurate belt tracking. (4" tracking wheels offer no advantage, they're heavy & soak up energy unnecessarily). We make our wheels 2-1/4" wide to accept any commercial 2" grinding belt. Includes sealed bearings which can easily be replaced when worn.Bore of the bearings is 1/2" & with this listing we include a grade 8 half inch bolt as an axle, with 2 nylon spacers, 1 half inch washer & 1 half inch jam nut. We use these wheels in our top quality grinders & have tested them extensively. We do not paint or anodize our wheels as this just comes off basically on your first use. Please also have a look at our other listings, visit our Ebay store & search OriginBladeMaker on Youtube for some other fun stuff.