This listing is for 20 Wera 25mm Impact Rated (PH2) Phillips 2 Bi-Torsion Extra Tough Screwdriver Bits & Storage Box. Model: 057751. These bits are specially designed to withstand the higher torque levels generated by Impact Drivers, making them ideal for sheet metal fastening. The bits are designed for Phillips screws requiring a PH2 bit. These are from Wera's 'Bi-Torsion' range, designed for professional users. Made from Wera's Extra Tough steel, they are perfect multi-use bits, ideal for use on timber (hard and soft), metal sheet and structures, general construction, plastics, and wall plugs. They are colour banded for identification and have a 1/4inch hexagon drive, which fits into standard screwdriver bit holders. The tip is (PH2) Phillips 2, and the length of each bit is 25mm. All 20 screwdriver bits come in a handy Wera storage case with a quick release lid and identification stamp. Drive: 1/4In-hex.