The materials from which bits are manufactured and the finishes applied to them play a significant role in the life and performance of the bit.  HSS Straight Shank Twist Drills HSS Straight Shank Twist Drill

• Steel bits work well for boring in softwood, but dull quickly in hardwood.
• High-Speed Steel (HSS) bits are harder than steel bits. They resist heat better and stay sharp longer. They can drill wood, fiberglass, PVC (polyvinyl chloride) and soft metals such as aluminum.
• Cobalt bits are extremely hard and dissipate heat quickly. They're mostly used for boring in aluminum and tough metals such as stainless steel.
• Black oxide-coated HSS bits have a finish designed to help resist corrosion and increase durability. They last longer than basic HSS bits and work well on a variety of materials, including metal, hardwood, softwood, PVC and fiberglass.
• Titanium-coated HSS bits produce less friction. They're tougher than basic HSS bits and stay sharp longer. They work for drilling wood, metal, fiberglass and PVC.
• Carbide-tipped bits stay sharp much longer than steel, HSS or titanium bits. They're effective for drilling tile and masonry.   HSS Straight Shank Twist Drills HSS Straight Shank Twist Drill
  

   HSS Straight Shank Twist Drills  HSS Straight Shank Twist Drills HSS Straight Shank Twist Drill

HSS Straight Shank Twist Drills Din338

HSS Straight Shank Twist Drills Din340

   HSS Straight Shank Twist Drills  HSS Straight Shank Twist Drills HSS Straight Shank Twist Drill

A twist bit is the most common type of drill bit for home use. It works for general-purpose drilling in wood, plastic and light metal.

For a typical 135-degree angles drill bit,  are suited for drilling into harder material. They may require a pilot hole to keep the bit from wandering.

Bits with 118-degree angles — are suited for softer material. They stay on center better and produce cleaner entry and exit holes.

Bits with split-point tips improve drilling accuracy by keeping the bit from wandering when you begin to drill.

Bit size reflects the diameter of the body. can be available as customized.

The chuck on a hand drill or drill press secures a drill bit to the tool along the bit's shank.

• A round shank allows you accurately center a bit in the chuck.
• A hex shank has flat surfaces, allowing the tool to grip the bit more securely for greater torque. Hex shanks such as the one in the image above work with quick-change chucks — common on cordless drills — allowing you to insert and remove them without tightening and loosening the chuck
• An SDS (slotted drive system) shank is designed for use on a hammer drill; it fits a spring-loaded chuck that doesn't require tightening. The bit can move forward and backward with the hammering motion of the drill while flattened areas and slots on the shank allow the chuck to hold the bit.

     HSS Straight Shank Twist Drills  HSS Straight Shank Twist Drills HSS Straight Shank Twist Drill

     HSS Straight Shank Twist Drills  HSS Straight Shank Twist Drills HSS Straight Shank Twist Drill

     HSS Straight Shank Twist Drills  HSS Straight Shank Twist Drills HSS Straight Shank Twist Drill