Designed for heavy screwdriving work and precise drilling in different materials - you need a set of robust screwdriver bits and multi-material drill bits to do your interior work. Then the Pro Impact Mixed Set is the right choice. The screwdriver bits are made from modified steel for greater stability. Thanks to the laser markings, you can select the required bit in no time at all. We used the same modified steel to make the drill bits and have carbide tips so you can easily drill new holes. The PRO Impact Mixed Set is a good choice for interior builders and installers who need reliable screwdriver bits and drills. The screwdriver bits feature a torsion zone, torque loads are absorbed at the tip of the bits to ensure they do not break. The bits have colour-coded rings that indicate the head type and laser markings to help you choose. The HEX-9 Multi Construction drill bits feature durable cutting edges and carbide tips for added hardness. Your spirals on the drill bit efficiently remove chips and thus extend the life of the drills. The set is housed in a sturdy case and arranged in brackets from which you can assemble your own tool box. Impact resistant 1/4" hex shank for use with impact drivers and drills.