All Bailey Slabrollers have two rollers to compress the clay which ensures perfect thickness and compression throughout the entire slab. The machine stays stationary while the clay, sandwiched in canvas, moves through the rollers. DRD II Series: Outstanding performance and value. Bailey has succeeded in building a thoroughly professional slabroller with all of the rugged features you have come to expect but at an extremely affordable price. The two-roller system ensures that with one pass a perfectly compressed slab can be formed. Also, with a Bailey you turn one knob to adjust the slab thickness from 1/32″ to 1 1/2″.