Drills - Jobber HSS

• Fully Ground body, bright white finish for the most accurate hole dimensions and high concentricity. • Hardened high speed steel body provides additional safeguard. • Strict tolerance for accurate and precise holes. • Straight Shank Twist Drills with Deep flutes for clean & fast chip removal. • 135 degree split point starts on contact with no walking or skating. • Suitable for general drilling in a wide  variety of materials such as wood, Steel, Cast steel, Malleable iron,   Sintered metal, Non-ferrous metal and plastic.

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Prior to using wood screws, it is advisable to drill a “Pilot Hole”. In case of an assembly of Drill and Countersink, one needs to determine the proper diameter of a drill to achieve the perfect hole size to accept a specific screw, or vice versa: the correct screw size (Gauge) for a given drill diameter. A “Pilot hole” is a hole drilled into a wood surface prior to installing a screw. Pilot holes help to:

♦ Prevent wood from splitting from large screws or when near the end or edge of the board.
♦ Improve positioning accuracy by providing a guide path for the screw to follow. This is very handy when installation of screws is done “Freehand”.
♦ Makes driving the screws into the wood easier.

Many parameters influence matching the drill diameter to the screw size (Gauge). Type of wood, moisture content, working conditions and angle of operation have great impact on this task. The following chart will give you a quick guideline.