TM 9-243TYPES AND USES - ContinuedRATCHET SCREWDRIVERSJEWELER’S SCREWDRIVERSRatchet screwdrivers are used to drive or remove smallscrews rapidly. The spiral ratchet screwdriver automati-cally drives or removes screws. It can be adjusted to turnleft, right, or locked to act as a common screwdriver.Some spiral ratchets have a spring in the handle whichautomatically returns the handle for the next stroke.Another style of ratchet screwdriver has a knurled collarfor rotating the blade with your fingers. The spiral typehas separate blades (1) that are inserted in thechuck (2). The common ratchet screwdriver has oneintegral blade (3).SCREWDRIVER BITSA screwdriver bit is a screwdriver blade with a square,hex, or notched shank so that it can be used with othertools:Breast drillSocket wrench handleRatchet bit braceJeweler’s screwdrivers are made for driving andremoving small size screws. They usually have knurledhandles (1), and a swivel end finger rest plate (2). Thetips (3) range from 0.025 inch to 0.1406 inch wide. Somejeweler’s screwdrivers have removable blades.FLEXIBLE SCREWDRIVERSA flexible screwdriver has a spring steel blade whichbends, allowing the user to get around flanges, shoul-ders, and other parts to drive and remove screws.22-4
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