# Tools: Screwdriver Bits
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Slotted or flat-head screwdriver bits.
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This jubilee clip requires a flathead bit for adjustment The flat-head is the most commonly used type of bit. Ensure bit fits snugly into screw slot to avoid slipping or breaking the tip. Head can vary in size from 3/32-inch to 1/2-inch. Not recommended for use with power tools.
Phillips screwdriver bit.
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Phillips head screws This is another common bit used in association with Phillips-head screws. Use this bit with hand and power tools. The bit, designed to cam out, lets you avoid the risk of shearing the screw should the torque become too great. Sizes start at 000, (smallest), through 00, 0, 1, 2 and so forth, increasing in size.
Pozidriv & Supadriv screwdriver bits
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Pozidriv screw heads Pozidriv & Supadriv bits are variations on the Phillips bit, the difference being that they do not cam out, allowing a greater torque when tightening. You can use Pozidriv bits in Supadriv screws and you can use Supadriv bits in Pozidriv screws.
Robertson or square screwdriver bits
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Common in Canada, these bits include a male tapered square shaft that fits into a female tapered square hole in the screw head. Sizes range from 00 to 3. Problems licensing this profile has restricted using it outside Canada.
Torx or star screwdriver bits
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Torx or star head screws The manufacturer specifically developed these bits to resist cam out once you could accurately set torques on drivers. These bits are in common use in the automotive and electronics industries. Sizes range from T1 to T100.
Hex or Allen screwdriver bits
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Sometimes known as hex heads, these bits could be considered as straight Allen keys.
They are available in both imperial and metric sizes. Don't damage the fastening or bit through ill-fitting size combinations. This profile offers a suitable alternative to the Robertson profile.
Tri-Wing screwdriver bits
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Use the Tri-Wing headed screws in the electronics industry to discourage owners from tampering with goods as it's difficult to obtain Tri-Wing screwdrivers. The screw head has three slots expanding from a triangular hole in the center.
Torq-set screwdriver bits
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These bits are similar to Phillips bits. However, close inspection of a Torq-set screw head will show that the four slots are offset from each other at the center. Workers use this profilein the aerospace industry, particularly where correct torque settings are paramount.
Other bits.
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You can find many other bits fitting specific screw head and bolt head profiles. Flexible bits and magnetic bits aid fixing in restricted space . Expansion bits facilitate repairs in normally out-of-reach locations.
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