<p>The Minus Screw Driver is a hand-operated tool to turn slotted-head screws. The use of Minus Screw in military hardware gave birth to a new hand-tool &ndash; the Screw driver. Early on during the early 15th&nbsp;century, the screws were used to join the pivot point of body-armours and fire-arms. It is believed that Minus Screw Driver was first invented in either Germany or France and is also known as Minus screw-puller or turn-screw.&nbsp;</p>
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<p>A hand-tool that is widely used across the world, the Minus Screw Driver in Chennai or Delhi will have the same feature. The Minus Screw Driver is made of tough steel that will resist any kind of bending or twisting when applied to hard jobs. While earlier the tips used to be plain, today, the blade tip of Minus Screw Driver in Chennai will have been treated with a dark tip coating for improved visibility between the tip of the Minus Screw Driver and the head of the Screw. The handle is made of either wood, plastic or metal with either a hexagonal, square or oval cross-section that allows better grip and ergonomics.</p>
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<p>The modern Minus Screw Driver in Chennai workman&rsquo;s possession will be an evolved one. While the earlier types used to be a single piece set-up, today the Screw Driver in use will have a shank that could be removed and replaced. The shape and design of the handle is such that it will comfortably fit with indentations of the worker&rsquo;s hand. Some minus screw driver will have hexagonal section at the base of the handle. This comes in handy when you need to increase the amount of torque to get the Screw on or off. A Ring or open spanner is fixed to achieve this. Some Minus Screw driver in Chennai workman&rsquo;s inventory will have a fixed shank, but with removable bit heads. These are more used in light jobs.</p>