With this special set of bits you can solve those screwing problems where the safety aspect is paramount the special types of screws cannot be unscrewed using conventional bits this bit set is especially suited for working in electronics repairing computers and in electrical work thanks to the machine faced shank working in confined spaces is also possible set contains machine faced shank also suitable for work in confined spaces 4 tensioning bits 4 6 8 10 mm 3 clamping bits size