Toro 21.00 Inch OEM Narrow Wiehle Roller Assembly. This roller has a 2.50 inch diameter. This Assembly comes with a Wiehle roller, roller shaft, ball bearings, lock nuts, seals, V-rings, roller rebuild kit & grease. A Wiehle roller has groves built into the roller as a standard Wiehle roller is smooth. Toro OEMs are created to keep your equipment up and running with the highest quality parts. To verify that this fits your Toro equipment, please do a model & serial number search.