Size: Overall length: 4.1", Body diameter: 0.75". Compatibility: Fits 10mm diameter round shank to 1 thread adapter .27cm for drill chuck. Application: The adapter connects the drill to the earth auger. Note: If this adapter is to work with a thread locker when there is reverse movement, you can always use a thread lock on the screw holding the two pieces together to solve this problem. Description: The drill adapter to auger is made of durable steel, it provides longer service life, sturdy and durable. It with 2 flats on the 0.3cm shank to match the chuck teeth of your cordless drill. Specifications: Material: Steel Overall length: 4.1 in. Body diameter: 3/4" Shank: 0.8 cm diameter x 4.3 cm length. Fits Hiltex, for corded drill and cordless drill. 10mm dia round shank to 1/2" thread adapter for drill chuck. Note: We always do our better to provide customers with quality products and excellent service. If you have any product problems, please contact us by email, we will reply to you in time. Package contents: 1 x auger electric drill adapter.