![]() ![]() Mechanical engineers often have to cut and strip wires, so most carry at least one multi-tool with pliers. ![]() Ratcheting screwdriver sets also include Posidriv screw bits, used to avoid "cam-out" or slippage from the slot of Phillip's head screws, and the bow-tie-shaped clutch screw, which was initially used in automobiles between 19, as well as in travel trailers, as late as the 1970s. You sometimes see the two-pronged spanner bit in your ratcheting screwdriver set, used to prevent tampering with bathroom stall doors. Tri-wing screw slots look a little like the three central rays of a car's steering wheel. Some older video game systems used tamper-proof drivers such as the Tri-wing. It includes the familiar flat-head and Phillips bits, but it also provides more specialized drivers and bits, such as the hexagonal Allen bit and the six-lobed Star, along with the square-slotted Robertson bit. A ratcheting screwdriver set contains a screwdriver handle and multiple bits. ![]()
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