A screwdriver bit is the replaceable working end that fits into a driver or drill. Instead of using a fixed screwdriver, you swap bits depending on the screw type.
Phillips (PH) – Cross-head screws, very common in general use
Pozidriv (PZ) – Improved grip cross-head, widely used in Europe
Torx (TX/T) – Star-shaped, used in automotive and machinery
Slotted (flat head) – Simple straight groove screws
Hex / Allen bits – Hexagonal socket screws
Security bits – Tamper-resistant designs for specialised fasteners
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