A dust mask is a flexible pad held over the nose and mouth with the help of elastic or rubber straps to protect against dusts encountered during construction or cleaning activities viz. dusts from dry wall, brick, wood, fiberglass, silica (from ceramic or glass production),or even sweeping.
Drilling machine can be defined as a machine which makes a circular hole in the job by removing volume of the metal from it with the help of a cutting tool called drill bit. When drilling is performed by the drilling machine the drill bit i.e. the cutting tool is rotated along its own axis into the job.
A file is a tool used to remove fine amounts of material from a workpiece. It is common in woodworking, metalworking, and other similar trade and hobby tasks. Most are hand tools, made of a case hardened steel bar of rectangular, square, triangular, or round cross-section with one or more surfaces cut with sharp, generally parallel teeth. A narrow, pointed tang is common at one end, to which a handle may be fitted.