New style roller brake applies pressure to both rollers at once, eliminating the need for ratchets or sprockets. Replaces wooden brakes. Can be used on older tables with 2-inch rollers, bypassing the sprockets or ratchets. For tables that have a motorized fabric advance, only one brake is necessary. Order two brakes for tables with four rollers (three canvas-covered rollers and one leveler bar). This part fits all generation models.