Size: Total length: 10.4 cm, body diameter: 3/4inch. Compatibility: Fits 10mm diameter round shank to 1/2inch chuck thread adapter. Application: Adapter connects drill to auger. Note : If this adapter needs to work with a thread locker when there is reverse movement, you can always use a thread locker on the screw holding the two parts together to solve this problem. Application: The adapter connects the drill to an auger. Description: The electric drill adapter is made of durable steel, it provides longer life, sturdy and durable. With 2 flats on the 3/8inch shank to match the chuck teeth of your cordless drill. Features: Material: Steel. Overall Length: 10.4 cm. Diameter of the body: 1.9 cm. Shank: 0.8cm diameter x 4.3cm length. Compatible with corded drill and cordless drill. 10mm diameter round shank to 1/2inch thread for chuck. Package: 1 Power Drill Adapter.