[Professional Design]: This heavy-duty drill stand is specially designed for electric drills with a diameter of 38mm to 43mm (1.48 inches to 1.7 inches). With this drill stand, it is possible to drill holes on surfaces, round workpieces and plates with absolute precision. [Bottom Bracket]: It has a sturdy column, a slot for installing a vise on the base, and 4 clamping points for firmly fixing on the workbench, a depth adjustment scale, and an adjustable scale ring. Set the drilling depth precisely until the last millimeter. [Precautions for use]: In order to prevent the tip of the drill bit from escaping, dent it with a central nail where it hangs on the hole. If the drill is not firmly fixed, the drill may float during lifting. If the restraining base and material are on your hands, it will cause serious injury on the blade, so please take off your military hands before starting work. If you want to open a hole with a hand-held electric drill, then if you want to open a vertical hole, even if it is not lost to the force of a hand bump or an electric tool, it is easy to brush into the straight hole. Although the material is made of wood, because the wood has hard parts, the refill may escape depending on the condition of the wood. If it is the lower hole of the screw, although there is no problem, it may not be able to open the vertical hole depending on the product. [Product specifications]: (product size) 40 cm high × 15.5 cm wide × 15.5 cm thick ●"Adjustable angle" 0°~90°, use this drill holder to open the oblique hole ●"Material" aluminum die-casting. ● "Sliding type" up and down sliding type. The base is equipped with 4 screws. Maximum working stroke: 60mm