Magnetic Chuck, Surface Length 18 in, Surface Width 6 in, Rectangular, Avg. Max. Holding Power 40 to 50 psi, Magnet Type Permanent Ceramic, Pole Alignment Transverse, Base Length 18 in, Base Width 6 in, Compound Style No, Features Non-Removable Handle, Can be used alone as a Parallel Chuck, Lubricated and Sealed Chucks, Designed to Bolt Directly, Side and Back Rails