Armeg Precision Screwdriver Bit Set is designed for screw driving applications where precision is essential and includes a range of 4mm Hex precision screwdriver bits. Also featuring an interchangeable ESD ratchet, this set is ideal for working on electronic devices and electrostatically sensitive components. The 3 way ESD ratchet provides versatility for tightening, loosening and using as a conventional screwdriver. Set contains 1 x Interchangeable ESD Ratchet 4mm Hex Precision Screwdriver Bits, 1 x Slotted 1.0, 1.5, 2.0, 2.5, 3, 1 x Philips 000, 00, 0, 1, 1 x Torx 5, 6, 7, 8, 9, 10, Hex 0.9, 1.3, 1.5, 2.0, 2.5.