Angle Drill Holder GuideFREEHAND DRILLING LIKE A PRO! With this lightweight, practical attachment, drilling precise, centered holes becomes a child's play. Whether its on the wall, on the ceiling, at a slant, or in round materials, exact drilling is easy. ACCURATE CENTERED HOLES Simply twist the base plate for immediate centering on board edges. Double guide bars are attached to the cast metal base scale and can be shifted back and forth to set your preferred angle up to 45.