Features 1、Our hinge bit set is perfect for pre-drilling hinges for screws. 2、Great for interior and exterior doors. 3、Commonly refered to as a vix bit the spring loaded guide centers the built-in drill bit inside the holes of a door hinge, cabinet hinge, bracket, or other hardware that requires a centered pilot hole. 4、They measure approximately 4" long press your bicycle lamp on wheel when you need to use it ,put the power head of generate electricity lamp coincide with the wheel ,then Can drive the generator power generation through the Friction safety ,environmental 5、The bit is surrounded by spring loaded guides that have a widow to show the drill bit depth while making adjustments. Features: 1. Our hinge bit set is perfect for pre-drilling hinges for screws. 2. Great for interior and exterior doors. 3. Commonly refered to as a vix bit the spring loaded guide centers the built-in drill bit inside the holes of a door hinge, cabinet hinge, bracket, or other hardware that requires a centered pilot hole. 4. They measure approximately 4" long press your bicycle lamp on wheel when you need to use it ,put the power head of generate electricity lamp coincide with the wheel ,then Can drive the generator power generation through the Friction safety ,environmental protection. 5. The bit is surrounded by spring loaded guides that have a widow to show the drill bit depth while making adjustments. 6. They come in the 3 most common hinge screw sizes 7/64",9/64", & 11/64". 7. The 7/64" is good for drilling holes in smaller hinges and hardware like decorative boxes. 8. The 9/64" is ideal for medium to full size hinges and hardware. 9. The 11/64 is perfect for door hinges, gate locks and all large hardware. Specification: Material: High-speed steel All shank size:1/4in Hole Size: 5/64in 7/64in,9/64in 11/64in, 5mm, 13/64in, 1/4in Package list: 7 x Hinge Hardware Drill Package List