A set of high-quality 5/16" shank bits complete with 1/2"D adaptor and suitable for use with an impact driver to loosen stubborn or corroded screws, nuts and bolts. It contains the most commonly used sizes, including; Ph2, Ph3 Phillips and 8mm slotted screwdriver bits together with 4mm, 5mm, 6mm and 8mm hex bits. All supplied in a blow mould case for convenient storage, ideal for workshop and automotive use.