The drum drive belt is made to wrap around the drum, slip on the tension pulley to rotate the drum. If your dryer drum won’t turn when in operation, the drum drive belt is probably broken and will need to be replaced. This drive belt is 3/8” wide 100” long with 5 ribs and 4 grooves. It is recommended to disconnect the power to your dryer before you start your repair. This drum drive belt is a genuine OEM part.