________________ are Steel bits which are screwed to the ends of drill rods and they can be attached to or removed from …

________________ type of drill consists of a long Steel bit which is mechanically lifted up and dropped down to disinteg…

The _________ is gripped by a chuck at one end of the drill and is pressed against the target material and rotated.

________________ are usually mounted on two or four pneumatic tyred wheels.

____________ type Trencher can dig a trench up to 10 m in depth and 4 m in width.

_________________ are also known as a wood or dowel bit.

A ____________ consists of a coil whose diameter is about 50 mm to 100 mm.

________________ type of excavator carries the skimmer at its lower end.