Belt Width: 42 in; CEMA Series: B; Idler Type: Steel Return Training, Positive Arm; Roll Diameter: 4.00 in; Roll Material: Steel; Lubrication Type: Factory Sealed; Allowable Bolt Spacing Center to Center on Each Mounting Pad in Belt Travel Direction [min]; Product Line: Idlers-Return Training Idlers-Positive Arm Type; Series: Rex Classic Series B+; Model = 4 in