SURETORQ 61-Piece Special Bit Set The bits are made of S2 alloy tool steel, achieving a perfect balance of hardness and toughness. Through specialized heat treatment, their performance is further enhanced. This set includes 60 bits in 11 different specifications, covering a wide range of special drive types. These bits are widely used in professional fields such as automotive manufacturing (Audi, BMW, Opel, Mercedes, Porsche, Volkswagen, etc.), electronics, elevators, military, aerospace, and more. The set also comes with a magnetized extension rod for connecting the bits to power tools. In addition to the standard configurations, we also offer customized sets with various specifications to meet your expanding needs. SURETORQ—No screw that can't be tightened, no nut that can't be loosened!