Belt Width: 20 in; CEMA Series: B; Idler Type: Steel Roll Flat Carrying; Roll Diameter: 4.00 in; Roll Material: Steel; Lubrication Type: Regreaseable; Rise of Mounting Pad Surface to Center of Roll: 4.25 in; Allowable Bolt Spacing Center to Center on Each; Product Line: Idlers-Flat Idlers; Series: Rex Classic Series B+; Model = 4 in