Fowler Full Warranty 52-580-030-0 Granite Gage Stand, 8" Column Height, 0.00005" Flatness, Fine Adjust 1 year warranty offered by Fowler High Precision Sturdy and compact with extreme stability. 6" x 6" x 2" granite base (Flatness: 0.00005") Positive lock screw Fine adjustment knob for zero setting with microscrew fingertip control Column height is 8" and accepts all lug-back indicators