Hole-in-one 2004 for double gang box. A magnetic detection system for electrical boxes and for precise and fast centering. Hole-in-one can be used on both hard and soft board materials such as chipboard, different types of fibre boards, wooden panels, Perstorp laminate, marble, ready covered boards, plasterboards, etc. Best effect at thickness up to 15 mm. The insert includes seeker (8:21) and box insert for double gang box (8:25).