291-002 4 x 36 inch belt sander frame with platen is designed to mount on the motor, hold the yoke and have a non-replaceable platen. This frame has mounting holes for the adjustable steel work table.
291-018 INDUSTRIAL BELT SANDER AND BELT GRINDER FRAME
291-018 industrial belt sander and belt grinder frame that's manufactured out of cast iron. The cast iron frame is used on 4 x 60 inch sanders, 3 x 90, 4 x 90 and 6 x 90 inch grinders.