The metal part of the high-quality BEARGRIP screwdriver is made of chrome-molybdenum-vanadium steel. which ensures high surface hardness on the one hand. on the other hand, optimal torsional strength when transmitting high torques. 54-56 HRc. Special plastics are used to make the two-component handle. which gives it increased mechanical strength and oil/chemical. UV radiation and temperature resistance. 2-K Micro Torx screwdriver. series 755.