1.Drill bit (Drill bit) used to work to cut wood within a circle. There are 2 sections, a torso, and the end of the helix. Helix at the end is a small spiral sharp.The spiral is both coarse and fine; The size of the drill bit called a fraction 16 finger always, such as size 3 / 16 "(enough said, this refers to the size of the hole diameter to penetrate the). At the base of a tapered edge for Champa hold tight!2. Drill head (Expansive extended bit) the head can be enlarged or reduced by the sliding end of the drill hole used and since 1 "or above. Can penetrate up to 4 "suitable for key hole and water service through the house with a lid (wood)
3.Drill deep (Foerstner bit rule) the drill head is high. There are both spiral and not a strand. Which will penetrate the deep drilling, drilling special to use in various jobs, as well as the key hole or hole channel speaker, radio etc.¼ "- 2"
.4.The drill bit (Straight-shank drill) use a small round hole type of drill bit side wings 2 pollen is spiral in each spiral groove for collecting a splinter. The size is in the market since 1 / 16. "– ½."
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