AD – Access Door Drill Adapter (3/8” Drive) A purpose-made drill adapter designed to speed up the opening and closing of hand-wound knobs commonly found on ductwork access doors. Ideal for commissioning, maintenance and inspection work where multiple access doors need to be opened and closed, the AD Adapter allows a drill or driver to do the repetitive winding — reducing hand fatigue and saving time on site. Key Features 3/8” drive – designed for use with a standard 3/8” drive drill adapter Purpose-designed profile – internal geometry locates securely over common hand-wound access door knobs Carbon fibre reinforced nylon construction – tough, lightweight and more resistant to impact and brittleness than standard PLA or PETG Compact design – useful in restricted spaces and for overhead access doors Faster operation – eliminates repetitive hand winding when opening and closing multiple access doors Ideal for site use – particularly useful during commissioning, inspection and maintenance work Important – Correct Use The AD Adapter is designed as a winding tool, not a high-torque loosening tool. Always make the initial loosening turn by hand before using the adapter. Once the knob is free, use your drill or driver at a low, sensible torque setting to wind it open. When closing, use a low torque setting and finish tightening by hand. Do not use impact mode or excessive torque. Used correctly, the adapter takes the repetitive twisting out of access door work and lets your drill do the winding for you.