1High Quality Stainless Steel: The drill bit is made of accuracy ground high quality stainless steel. Each piece is treated with rust proof satin appearance, which is high in hardness and durable. 2High Compatibility: The drill bit is compatible with small wrenches, cordless screwdrivers, low speed DC hand drills, and is mainly used for screwdrivers in small spaces such as computer cases and electrical cabinets. 3Flexible Drill: The drill can be bent, twisted and rotated at many different angles, can touch a small place, and work flexibly in various gaps, rather than by hand. 4Rotating Inner Shaft: The inner shaft of the drill has a wide range of rotation and stable quality. When the shaft rotates inside, the flexible black sleeve protects your hands from injury and does your job perfectly. 5Wide Variety: A wide variety of drill tool sets can meet various requirements and can provide ideal solutions, including easy removal, disassembly and reinstallation of awkward automobile nuts, bolts and screws. Item Type: Drill Extension Material: Stainless Steel Screwdriver Head Model: Flat 4, Flat 5, Flat 6, PH0, PH1, PH2, PH3, T15, T20, T25 Flexible Shaft Length: Approx. 300mm / 11.8in Short Turn: Hole Depth Approx. 12.5mm / 0.5in Colour Straight Shank Hex Shank to Square Head Post: Model Width of Square Head (Approx.)Width of Six Sides (Approx.)Total Length (Approx.) 1/4 (65mm)6.35mm/0.3in6.35mm/0.3in65mm/2.6in 3/8 (65mm) 9.5mm/0.4in6.35mm/0.3in65mm/2.6in 1/2 (73mm) 12.7mm/0.5in6.35mm/0.3in73mm/3in Quick Release Self Locking Post: Length 60mm, 100mm, 150mm, Hex Handle Diameter 1/4in, Hex Hole Diameter 1/4in Universal Sleeve: Square Caliber Approx. 9.5mm / 0.4in Straight Shank Hex Rod to Square Head Rod: The width of the square head is 9.5mm, and the width of the six sides is 6.35mm Adjustable Hex Rod to Square Head Rod: Total Length (Approx.)Width of Square Head (Approx.)Width of Six Sides (Approx.) 54mm/2.1in6.35mm/0.3in6.35mm/0.3in 55mm/2.2in9.5mm/0.4in6.35mm/0.3in 58mm/2.3in12.7mm/0.5in6.35mm/0.3in 10 x Screwdriver Head (a Set) 2 x Flexible Shaft 1 x Short Turn 3 x Colour Straight Shank Hex Shank to Square Head Extension 1 x Straight Shank Hex Rod to Square Head Rod 3 x Adjustable Hex Rod to Square Head Rod 3 x Quick Release Self Locking Post 1 x Universal Socket The parameters are manually measured, there is a certain error.