Milescraft® is a leader in drill accessories. The DrillMatePro™ is a professional, portable drill press that delivers easy repeatable precision drilling. The drill guide is constructed with metal for increased durability, performance, and accuracy. This heavy-duty drill guide serves as a portable drill press guide when the work is too large or awkward to take to the drill press table. The 1/2" keyed chuck accepts larger and longer drill bits, hole saws, and spade bits. The chuck also spins effortlessly with the help of its dual ball bearing design. To ensure accurate and precise results, the extruded guide head is fit with bronze bushings to the keep the drill bit on target. Aligning the DrillMatePRO™ couldn't be easier with all of the available centering options. Convenient centering lines machined into the base makes it easy to hit the mark every time. For increased precision, drop in the included alignment disk for pin-point accuracy. The V-Grooves in the base not only help center the DrillMatePRO™ but also allow for round stock to sit stable when drilling holes. Additionally, two included centering pins can be used either on top or beneath the base for simple twist and center drilling. With the unique independent depth stop system on the DrillMatePRO™ it's possible to drill to the exact same depth every time, while the springs prevent a heavy drill and bit falling onto the work piece. The dual spring design helps control drilling, and returns and supports the drill when not in use. They can also be removed to achieve greater drilling depth. The guide head can be locked in place when changing bits, or, when in use without the springs. The angle adjust allows for infinite angles off of vertical from 0 degree to 60. The wide base provides plenty of clamping room to keep the guide in place when drilling complicated angles, and the rubber feet on the base prevent slipping and marring on the workpiece. Not intended for use with impact drivers or hammer drills.