Construction drills, woodworking drills, high-speed steel drills, shapes and uses, what's the difference?
A construction bit, a carpenter's drill, has the same diameter as a shank and is longer than a bit of a high-speed steel.High speed steel drill stem generally 3.175mm diameter, see need, more than 6.5mm rarely.The drill bits in 3 are of different materials
High speed steel drills, straight shank twist drills, taper shank drills. Equal shank drill. It doesn't make much difference. That is, the handle is different
There are two types of woodworking drills. One is a carpenter's twist drill. The other is a flat drill. Woodworking twist drill is generally called woodworking drill, the head is 3 with spines, the middle of the long, needle. The sides are slightly shorter with a cutting edge. The blade has an opening. The flat head of a carpenter's drill is flat. A small hole in the center. The top is needle shaped. Without blade, (actually, the blade is at the ends of the flat head, in contrast to the opening of the shape) There are two kinds of handles, plain and six angles.
Construction and drilling is referred to as the cement drilling hammer drill. Used for opening holes in concrete, walls, etc.. The overall shape of the handle is straight, and the head is welded with alloy cutter head. No openings at the blade. Trough only.
