The torsion bits set has a length of 35 mm due to the torsion zone the bits have a longer life and a higher stability the slim torsion and the longer version can be reached very well deeper and countersunk screws the very high order bits are also suitable for extremely hard screwdriving eg b in the laying of terraces hardwoods content ph 1 2 3 1 2 3 pz t15 t20 t25 t30