Size: Total length 4.15", body diameter 0.75". Compatibility: Fits 10mm diameter round shank to 1/2 thread adapter " for drill chuck. Application: The adapter connects the drill to the auger. Note: If this adapter is to work with a threaded locker when it is there for a reverse motion, you can always use a thread locker on the screw holding the two pieces together to solve this problem. Description: The auger electric drill adapter is made of durable steel, it provides longer life, sturdy and durable. It has 2 flats on the 0.3" shank to match the chuck teeth of your cordless drill. Features: Material: Steel Length Overall: 4.1" Body Diameter: 3/4" Shank: 0.8" Dia x 1.75" Length Compatible with corded drills and cordless drills 10mm round shank diameter to 1/2" thread adapter for drill chuck. Note: We always do our best to provide customers with quality products. If you encounter any product problems, please contact us by email, we will respond to you in time. Contents: 1 adapter for auger electric drill. Sold by the grid cool store