Screwdriver bits buying guide

Choose a bit tip to match your screw drive

Screwdrivers transfer force (or torque) to the screw via the screw drive. The shape and size of the screwdriver tip must correspond perfectly to the screw you are working on or you run the risk of damaging the screw.

Screwdriver bit types

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Flat blade 

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Slotted screws are not very well suited to power driving as the screwdriver tip tends to slide around as soon as the tool gains any speed. These screws are found on old or specialist items. Sizes generally range from 3 to 6.5 mm.

Phillips

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Identified by the code PH, these bits feature a simple cross-shaped recess. Though widely used, Phillips bits tend to pop out of the screw head as the speed of the tool increases. For the most part, Phillips tips range from 0 to 3 mm in size.

Pozidriv

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These tips are designated as PZ. Do not confuse them with Philips heads at the risk of stripping the screw – and tearing your hair out in the process! PZ droves are cross-shaped with two (roughly) equal halves: there are two crosses, one of which is rotated by 45°.
This shape gives the screw tip better grip. Pozidriv drives (PZ) range in size from 0 to 4 mm and are most often found on wood screws.

Torx

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Torx, or star drives, are designated as T and provide very good grip. Increasing in popularity (decking screws, etc.), Torx heads are recommended for all your screwing tasks; with limited risk of slipping, you'll soon be screwdriving like a pro! Sizes generally range from T10 to T40 or up to T50 for application in car mechanics.

Resistorx or tamperproof Torx

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These screw drives are star-shaped with a pin in the centre and are used for increased security and comfort during intensive DIY sessions! Resistorx screw drives are mainly found in household appliances, with sizes typically ranging from T10 to T40.

Hex or Allen

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These screwdriver bits are also known as hex sockets. Hex or Allen screw drives are commonly found in flatpack furniture kits. The most common sizes range from 2 to 10.

6-point and 12-point nut setter

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Six- and twelve-point nut setters are not strictly bits but rather sockets. However, they are increasingly commonly found as solid constructions (one-piece sockets).

Triangular or square

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Triangular or square screw drives are not widely used and tend to be more annoying than helpful to DIYers – sometimes manufacturers can be cruel like that!

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Decking screws

Screwdriver bit materials

Screwdriver bits vary in terms of the complexity of their design and, most importantly, their strength. Like any product, the more expensive they are, the better the quality – in theory, at least!

Screwdriver bit materials

Steel bits 

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Steel is the most widely used material for bits as it offers good value for money (provided the bits are used correctly).

Impact-rated bits

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If you have an impact driver, you should use impact-rated bits as other bit types may break under the force.

Titanium-coated bits

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Titanium coated bits are more durable than steel alone. But beware: sometimes poor-quality steel is hidden beneath shiny titanium!

Diamond-tipped bits

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A fine diamond particle coating is deposited onto the tip; this process significantly increases the bit's grip.

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Impact driver

Screwdriver bits: choosing the best length

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Driver bits

Tips for choosing the best screwdriver bits

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Opt for high-quality screwdriver bits that match the type and size of your screws. Do not forget to drill pilot holes and always use quality screws.
You should also remember to adjust the torque of your cordless or electric screwdriver to protect the screwdriver bit and the screw head. This will also help you to avoid splitting wooden surfaces or damaging the screw thread if you screw into metal at high speeds. Finally, go for Torx and Pozidriv screws, if possible: the results say it all!

Screwdriver bit chart

Bit type	Abbreviation	Common bit size	Drive type	Bit material for standard use	Bit material for intensive use
Flat blade	/	3 ; 4 ; 4.5 ; 5.5 ; 6 ; 6.5 (mm)	Slotted	Steel, hardened steel	Diamond, Zirconium, High Chrome Vanadium Steel, Titanium
Phillips	PH	PH0, PH1, PH2, PH3, PH4	Phillips
Pozidriv	PZ	PZ0, PZ1, PZ2, PZ3, PZ4	Crosshead with ribs
Torx	T	T10, T15, T20, T25, T30, T40	Star
Resistorx (or tamperproof Torx)	TT	TT10, TT15, TT20, TT25, T30, T40	Star with pin in centre
Allen	BTR or HC	2, 3, 4, 5, 6 (mm)	Hexagon socket

More information

For more information on home improvement, check out our editors' other guides:
Screw buying guideElectric screwdriver buying guideDrill bits buying guideWall fixings buying guide