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Four specifications for every bit
| Specification | Decision | Avoid mistakes |
|---|---|---|
| Profile | Identify the exact PH, PZ, TORX, hex socket or other profile | Do not treat similar cross or star shapes as interchangeable |
| Size | Choose the size number required by the screw head | Do not use the correct profile in the wrong size |
| Fitting | Match the shank and holder according to their documented connection | Do not assume that a similar appearance guarantees a secure fit |
| Length | Choose a standard or longer version according to access | Do not confuse extra length with the ability to drive larger screws |
Example: three known furniture fittings
Sort the screws by profile and size and write down each combination. If you only need PZ2 and two TORX sizes, a small matching set covers the task better than a large set without the required sizes. If a screw is deeply recessed, also check whether the holder and bit together can reach it.
Bit or fixed-blade screwdriver?
Bits are useful when you already have a suitable holder or need to change profiles. For a single fixing used repeatedly, a fixed-blade screwdriver may offer more direct access. Related categories: Screwdriving tools.
