2 set tool:4 x Hinge Drill Bit & 2 x Twist Step Drill Bit These Pocket Hole Drill Bits are made of high speed.It combines high hardness, high impact resistance and high heat resistance. perfect for making high quality drill bits.Perfect replacement: these drill bits are a good alternative to the old or worn drill bit. Stable and sturdy enough to perform a variety of tasks. Easily into any kind of wood, and leaves a clean hole. Wide compatibility: Drill guide is perfect for kreg manual pocket hole jig system or used alone. Used for wood hole punching&positioning, aluminum punching, thin metal punching and so on.perfect for woodworking or DIY enthusiasts.durable and rust-proof.Have all the necessary parts, can fit correctly, the drill bit was sharp and cost-effective. PRECISE POSITIONING: No displacement, sawdust will be automatically discharged from top of hole on both sides, drill bit will not be blocked.AUTOMATICAL DISCHARGE: Sawdust will be automatically discharged from the top of the holes on both sides, without drill blocked. Never miss the center of the hole again, references from the hinge bevels. EASY TO REPLACE: Different hardness wood, need different centering drill, you just need take the screw apart and replace the drill.EASY TO INSTALL: Unique design and perfect punch effect. Applicable for the installation of the door hinge. Easy to use and install, change bits fast which one-handed load and release. Feature:A. Suitable for most general purpose electric drills;B.Efficient and accurate positioning;C. upgrade 135 degree inclined blade drill bit The pocket hole drills has great shape. its great to have the option of the 1/4 inch hex drive for quick installation in hex bit. Shank Type: round shank How To Use ? 1. Adjust the height of the drill bit. 2.Clip board which you want to drill. 3. Put thedrill into the hole in the wood. 4. Drill up 5 mm (remember not against the wood to drill). 5. Start the drill reaches a certain speed above 500 rpm, 1500 rpm is t