Shock Absorber zone Shock Absorber BlueFit Precision PH, PZ, TX perfectly fits screwheads and avoid slipping and destroying head geometry. The Blueshock screwbit offers a special design with elongated torsion zone, resisting to high torque and violent impacts. Its hardness suits the most powerfull machines. BlueRing Reinforcement A strong ring reinforces the head for an even longer resistance. BlueShape Anti-Breakage The flex zone is reinforced on each side for an even stronger link with the head and the attachment and avoid breakages.