High quality: The hinged drill is made of super hard alloy, which cuts more sharply, has excellent drilling ability, and can remove debris well.Features: The hinge hole opener opening is 35mm. The special design of the removable depth gauge makes drilling easier. It can work according to the center reference line and quickly locate the center point of hinge and mounting plate drilling.Easy to use: The hidden hinge clamp drilling tool guide device can quickly locate the center point of the hinge, even if you are not a professional, you can quickly locate the hinge and the center point of the plate drilling assembly.Fixed drilling tools: The drill group can be adjusted according to changes in the side of the door, suitable for drilling hidden hinges and door locks.Wide range of uses: Suitable for drills, pistol drills, bench drills, vertical drills, vertical electric drills, mobile magnetic drills, etc. Suitable for DIY woodworking or professional engineers.