The subdivision of the Wiha bit range into three colour-coded categories simplifies selection, and all bits are now suitable both for normal screwdriving tasks and impact screwdrivers.
The simple classification, based on the screw shape to be fastened, means the right bit is identified quickly.
Blue T bits are intended for screws with 90° angle at the screw head, which tend to lie flat against the material. For screws with angles of more than 90°, with more of a countersunk shape, there are yellow Y bits and, if the user wants to fasten both types of screws, there are red all-rounders-TY bits.
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