Precision machining and manufacturing, high hardness, good toughness, beautiful rust prevention and convenient installation, suitable for power distribution drill/gas drill and so on. 90 self-locking head design: self-locking chuck, no need for key fastening. 7.5mm hexagonal handle connecting rod, suitable for conventional gas drill/electric drill, safe and firm. Automatic drill chuck design: 0.8-10mm clamping range, easy to use. You will receive an electric drill corner device, which can meet the . describe Name: corner device of electric drill Material: metal+plastic color: Black Clamping range: 0.8-10(mm) Hole diameter: 11mm Hexagon diameter: 7.5mm Quantity: 1pc Package Contents: 1 x electric drill corner device Note: The turning device is not electric and needs to be used with an electric drill. Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.