The Wera BTH BiTorsion Extra Hard Bits for use with all combi and drill drivers, for impact tools use Impaktor bits. 

Significantly extend service life, ideal for use with screws into general construction materials and timbers.

Use with Wera BiTorsion Rapidaptor bit holder for ultimate service life.

Available in : PH2 / PZ1 / PZ2 / PZ3