SOLID materials.The drill bit is usually a rotary cutting tool, often multi-point.It produced a circular hole/cavity in the work-piece.ScrapersMechanical Scrapers Tool are made up of old files and the cutting edge of the scraper is hardened and tempered.They are mainly used to scrap metal surfaces by rubbing the work surface.The following types of scrappers according to shape are commonly classified asFlatHookTriangularHalf-roundFilesFiling is a method of removing excess MATERIAL from a workpiece by using a file.Files are manufactured in different types and grades to meet the VARIOUS needs.Common files of different shapes:Flat fileHand fileSquare fileRound fileHalf-round fileTriangular fileKnife-edge file.TapTapping is the operation done for FORMING internal threads by means of the tool CALLED tap.Before a tap is used for cutting internal threads, a hole is to be drilled.The diameter of the hole should be such that it should have sufficient material in the hole for the tap to cut the thread.