For accurate checking of concentricity on cylindrical workpieces. Bench Center Tolerances... Center Height: 0.0006" Bed Flatness: 0.0004" Center Parallelism to Bed: 0.0008" Center to Center Alignment: 0.0003" Bench Center Specifications... Height: 9.44" Length: 47.25" Weight: 330 lbs Part Centers 31.50" Dial Indicator not included. 5/8" x 60° MT2 centers are hardened and precision ground.Tail stock center is spring loaded and lever operated.Heavy Duty cast iron bed for added stability. Shipped via truck ONLY