This is a BLUEROCK Tools Z1T/S Tilting stand with vacuum base, compatible with all model Z1 Concrete Drills (4" Z1, 8" Z1, 10" Z1/Z1RB, 12" Z1T/S LRBTS) core drills as well as other brand drills with the same style of mount. Base of the stand: 12.5"x15.5" Total Drill Travel: 15" Total Stand Height: 39" Base is vacuum pump compatible (Center vacuum cap can be removed for traditional bolt anchoring) Adjustable angle tilting stand Leveling bubble for vertical drilling Vacuum pump not included. See our separate vacuum pump listing. Vacuum bases are not designed to work in every environment or application. Very rough surfaces, cracks or very uneven surfaces will reduce suction. Optimal adhesion is achieved on smooth and flat concrete with a strong vacuum pump.