PPI Hytrol 914.R7531 Conveyor Pulley Roller 4"x 31"BW 3/4-10 Hub Crowned

New surplus.  Has some shelf wear.
Steel pulley, with slight crown.
4" OD.  
30" Roller tube length. (rolling surface)
31" Bed width.  (Overall Width between hubs)
3/4-10 threaded hubs.