Feature●Superior Quality: Crafted from high-speed steel bits and hardened housings, our mortise drill bit are built to last and deliver exceptional performance. Quickly drill pilot holes for cabinets and door hinges with ease.●Versatile Set: The package contains 8 different sizes of hinge drill bits, 5/64, 7/64, 9/64, 9/64, 11/64, 13/64 , 5mm, 1/4", along with a hexagonal wrench for easy tool change. Adjust to the woods hardness for smoother operation and professional results.●Precision Design: Boasting automatic centering function, our hex shank drill bits center drill kit offers enhanced accuracy and efficiency, reducing drill bit walking. The double-hole design quickly discharges sawdust from both sides, preventing clogging and enabling smooth drilling●Easy to Use: Get precise punching effect and hassle-free door hinge installation with our unique design. Quickly change drill bits, load and unload them single-handedly, and enjoy stress-free woodworking. Experience the ultimate ease and convenience today!●Wide Applicability: Perfect for kitchens, furniture, windows, doors, and more, our impact drill bit set self-centering drill bits set are designed for different hardness levels, making them a versatile choice for professionals and DIY enthusiasts alike.Description