Toro 18.00 Inch OEM Wide Wiehle Roller Assembly. This roller has a 2.50 inch diameter. This Assembly comes with a roller tube, roller shaft, ball bearings, washers & lock nuts. A Wiehle roller has groves built into the roller. A wide Wiehle roller has a larger gap between each of the groves when a standard Wiehle roller, where a standard 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.