Size: Overall Length: 10.4cm, Body Diameter: 1.9cm. Compatibility: Fits 10mm diameter round rod 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 fix this. The auger drill adapter 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" Body diameter: 3/4" Stem: 0.8cm diameter x 4.3cm 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 best to provide customers with quality products and excellent service. If you have any product problems, please contact us by email, we will get back to you in time. Package content: 1 power drill to auger adapter.