JET 649005K 22X44 Plus 22-Inch 1-3/4-Horsepower Drum Sander, 115-Volt 1-Phase Zinc-plated steel tension rollers mount next to the drum to eliminate slippage Drum height and downward pressure are adjustable to eliminate snipe 1/16 inch per turn height adjustment for precision accuracy Thrust bearing height adjustment for easy adjustments Large, easy-to-use cast iron height adjustment handwheel allows both radical height changes and minute adjustments for extremely precise sanding thickness control