Ground drive belt drives the transmission, which propels the lawn mower wheels. Belt Size 3/8 x 35, 3L350. Replaces OEM # Toro 91-2258 Compatible with Toro walk behind lawn mower Model 20065 (280000001 & UP) This belt is NOT OEM belt. The OEM number is just for your help in looking for the belt you need! NOTE! Wear work gloves to protect your hands when installing this part. Ground drive belt 91-2258 Compatible with Toro walk behind lawn mower Model 20065 (280000001 & UP)