Features 1、Adopting brass body with high speed steel drill bit, high strength and hardness, durable in use 2、Quick to change drill bit by one-hand operation 3、Comes with 4 drill bits of the most common sizes for carpenter: 5/64 4、Features accurate positioning, effectively improve drilling efficiency 5、The wood chips will auto discharge from the top hole so the drill won't get stuck Specifications Description: This is a self-centering drill bit set for drilling holes for door or window hinge's installation. It helps to position accurately, easy to connect with electric drill and use, making your drilling precise and smooth. Features: Adopting brass body with high speed steel drill bit, high strength and hardness, durable in use. Quick to change drill bit by one-hand operation. Comes with 4 drill bits of the most common sizes for carpenter: 5/64", 7/64", 9/64" and 11/64". Features accurate positioning, effectively improve drilling efficiency. The wood chips will auto discharge from the top hole so the drill won't get stuck. Specifications: Condition: 100% Brand New Material: Brass + High Speed Steel Color: as Shown in the Picture Specification Length Hole Diameter Tapping Screw 5/64" 8.6cm / 3.39in 2mm 2.2~2.8mm 7/64" 8.9cm / 3.50in 2.8mm 3~3.5mm 9/64" 10cm / 3.94in 3.5mm 4~4.5mm 11/64" 10.2cm / 4.02in 4.5mm 5~5.5mm Quantity: 4 Pcs Weight: approx. 110g Package Included: 1 x 4pcs/set Door Hinge Drill Bit 1 x Hex Wrench Package List