Item Bench Center, Bench Center Style Guide Surface, Includes Moveable Column Yes, Operating Position Horizontal, Working Diameter 6 19/64 in, Maximum Working Length 11 13/16 in, Guide Surface Material Cast Iron, Overall Height 3 5/32 in, Overall Width 6 21/64 in, Parallelism +/-0.0004 in, Squareness .0004 in