The Roper Whitney No. 390 manual roll has 2 1/2″ precision turned and ground high carbon steel rollers. There are four wiring grooves 1/4″, 9/32″, 5/16″ and 3/8″. All rolls are standard with fully enclosed gear housings and all three rolls are driven. The upper roll lifts for conventional removal of the work piece. The maximum sheet length is 36″ with a thickness capacity of 16-18 gauge mild steel.