Marksman - 16-Piece Professional Twist Drill Bit Set 58037C

Quality Twist Drill  Bit Set Comprising of;-

• Tungsten Tipped, Titanium Coated & High Carbon Steel Drill Bits
• 1 x H.S.S. Drill Saw Titanium Coated
• 5 x Tungsten Tipped Masonary Drill; 5, 6, 7, 8 & 10mm
• 5 x H.S.S. Drill Titanium Coated; 5, 6, 7, 8 & 10mm
• 5 x High Carbon Steel Wood Drills; 5, 6, 7, 8 & 10mm
• Contained in Wooden Latched Case

Twist bits

Usually referred to as twist drills, twist bits are probably the most common drilling tools used by the handyman with either a hand or electric drill. The front edges cut the material and the spirals along the length remove the debris from the hole and tend to keep the bit straight.

They can be used on timber, metal, plastics and similar materials. Most twist bits are made from either:

• 'high speed steel' (HSS), these are suitable for drilling most types of material, when drilling metal the HSS stands up to the high temperatures.
• 'carbon steel', these bits are specially ground for drilling wood and should not be used for drilling metals, they tend to be more brittle, less flexible than HSS bits.

Twist bits are also available coated with Titanium nitride (TiN), these are easily identified by the gold like colour. This coating increases the hardness of the bit and adds a self-lubricating property. The coating is only really effective when metal is being drilled, it has little effect when working with other materials.

Twist drills are usually available in sizes 0.8-12 mm plus. They are designed for drilling relatively small holes, they sometimes tend to clog quickly especially when the wood is 'green' so when drilling deep holes (especially in hardwood) the bits should be withdrawn regularly to remove the waste.

Special care is required when using the smallest sizes since these bits are thin and brittle. Always hold the drill square to the work and apply only light pressure when drilling.

Sharpening - use a drill sharpener, a grindstone jig or an oilstone.

Titanium nitride bits cannot be sharpened without destroying the coating (although if the drill needs sharpening, the coating will probably have already been destroyed). Forming the correct angle at the tip is important for efficient cutting.

The price you see is the price you pay includes postage no hidden costs at checkout UK Mainland Only