HTC's exclusive, 3-point self-leveling system provides a solid, stable stance that requires no tilting or adjusting. Two rigid wheels with locking mechanisms and one locking swivel wheel make moving your machine in any direction effortless. Plus, your machine is held 3/4" off the floor at all times, eliminating the need to recalibrate those important settings that are usually thrown off by raising and lowering the machine every time it's moved.What goes in, must come out! As a result, these machines are given lots of floor space for infeed and outfeed. HTC Mobile Bases eliminate the need for this permanent space allotment, and allow you to place the machines into efficient, ergonomic positions within your workshop. Why not park your jointer next to your table saw and joint freshly sawn edges in one time-saving step. Or, place your planer and jointer side-by-side to reduce rough cut lumber into useable material faster than ever before. After use "park" or "corral" these machines to free up your valuable shop floor space.HTC Mobile Base HSB-2855. Fits Powermatic Model #54A 6" Long Bed 15'' x 24-5/8''; Style B2; base is designed to match curved machine cabinet.HTC Mobile Base HPJ-1980. Fits Powermatic Model #54 Artisan 6"; Style B2; Dim. A 13" x Dim. B 19".HTC Mobile Base HPLB-6. Fits Powermatic Older Models; Style J; Dim. A 17.12" x Dim. B 24.12".HTC Mobile Base HPLB-8. Fits Powermatic #60 Older Models; Style J; Dim. A 17" x Dim. B 24.75".