TX - T-Form, Y-Form, and TY-Form bits. Design: Patented WIHA bit technology with optimized torsion zone. High service life and particularly high quality standard. Color marking makes the bit noticeable and thus easy to find. The fluorescent coating makes the bit visible even in the dark with the help of a UV light source. T-Form is particularly suitable for T-shaped screws (cylinder head). Y-Form is especially suitable for Y-shaped screws (countersunk head). TY-Form is suitable for all types of screws. Delivery: Pack of 5 pieces.