These Pocket Hole Drill Bits are made of high speedIt combines high hardness, high impact and high heat . perfect for making high quality drill bitsPerfect 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 manual pocket hole jig system or used alone. Used for wood hole punching&positioning, aluminum punching, thin metal punching and so onperfect for woodworking or DIY enthusiastsdurable and rust-proof. Have all the necessary parts, can fit correctly, the drill bit was sharp and cost-effective. Used for wood hole punching&positioning,punching, thin metal punching, etc. Installation and removal is very easy, work well with the Manual Pocket Hole Jig Master System. 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. Type: round How To Use ? 1. Adjust the height of the drill bit. 2. board which you want to drill. 3. Put the drill 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 the best. 6. advanced to slow down, such as front-end drill in half or full, then can speed. colour:Silver Material:steel size: Diameter of Drill: 95mm/38 inch Full Length:160mm/63inch Package Contents: 2 x Twist Step Drill Bit 2 x Stop Collar 2 x Wrench Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.