UPGRADE BLACK TYPE Center Drill bit
Built-in black oxide steel case，which is harder, corrosion resistant & durable!
Built-in HSS4241(high speed steel W4Mo2Cr4V) drill bit，which hardness is up to HRC.48 ,great for soft metal drilling such as aluminum, wood, plastic.
"17PACK" & "15PACK" come with HSS4341(high speed steel W4Mo2Cr4V) drill bit, which hardness is up to HRC.62 ,great for hard metal drilling such as stainless steel, aluminum, wood, plastic.
BETTER MATERIAL FOR LONG TIME USE !
We also have SLIVER TYPE Center Drill bit for sale,which is the same as other seller.The SLIVER TYPE built-in aluminum case & carbon steel drill bit，only suitable for soft material drilling，such as wood，plastic！
SLIVER TYPE is good enough，but BLACK TYPE is better！
Efficient and accurate positioning
Automatic positioning center enhance accuracy and efficiency. Double-sided hole design - fast & automatic discharge sawdust from the hole on both sides
New upgrade 135° inclined blade drill bit
135° inclined blade drill bit make drilling easier and faster
Suitable for most general purpose electric drills
All center drill bit shank diameter is 6mm. Suitable for most general purpose electric drills
Satisfy all you demand
Perfect for hinges, handles, drawer slides, woodworking and etc. Suitable for professionals and DIYer
Use low speed when drilling (usually keep in 2000r/min - 3000r/min). Too fast speed will off center, break the bit or jammed
Drill bit size:
1) 5/64'': Hole diameter is about 2 mm,Use about 2.2 - 2.8 mm tapping screw
2) 7/64'': Hole diameter is about 2.8 mm,Use about 3 - 3.5 mm tapping screw
3) 9/64'': Hole diameter is about 3.5mm,Use about 4 - 4.5 mm tapping screw
4) 11/64'': Hole diameter is about 4.5mm,Use about 5 - 5.5 mm tapping screw
5) 5mm: Hole diameter is about 5 mm,Use about 5.5 - 6 mm tapping screw
6) 13/64": Hole diameter is about 5.2mm,Use about 6 - 6.5 mm tapping screw
7) 1/4": Hole diameter is about 6.5mm,Use about 7 - 7.5 mm tapping screw
- Use low speed when drilling (usually keep in 2000r/min - 3000r/min). Too fast speed will off center, break the bit or jammed
- When drilling the hole, please adjust according to the hardness of the wood. If the wood is soft, you can choose the smaller center drill bit. If the wood is hard, you can choose the corresponding or bigger one
- If you can't get the center drill bit out after drilling, use the hex key to separate the drill bit