STREBITO 50-in-1 Precision Screwdriver Set - S2 Steel Every driver bit of STREBITO precision screwdriver set is made with premium S2 steel and has a hardness of up to 60HRC for long-lasting reliability. STREBITO is Esperanto for "strive", which epitomizes our attitude and ambition: Make a better world with our products. We are a rising global manufacturer dedicated to making the finest hand tools , providing quality products and striving to create the best experience from purchasing through to using. S2 Steel Bits: Made of high-quality S2 steel, with sturdy hardened & tempered construction. Includes 47 pieces, 10 types: Philips, Tamper Proof Torx, Star, Pentalobe, Flat Head, Hex, Triangle, Tri Point, Gamebit, Nut Driver, Robertson, Spanner, ICS. Electronic Tweezers: Pick up and handle tiny screws and other small components.