This is a professional 7 piece combination tapping drill bit set by Wera in a padded stable plastic storage box. It features a 1/4"" hex drive, making it suitable for use with screwdriver bit holders or directly in a drill. The set comes with a Rapidaptor quick-release chuck for fast bit changes in power screwdrivers or electric drill chucks. The hexagonal shaft ensures excellent power transfer. HSS stands for high speed steel, offering finely-tuned material elasticity for great durability, good centering properties, easy cutting, perfect chip removal, low tilt risk, and precise return movement. The set includes bits for M3 (2.5mm) x 36mm, M4 (3.2mm) x 39mm, M5 (3.8mm) x 41mm, M6 (4.5mm) x 44mm, M8 (6.2mm) x 51mm, and M10 (6.4mm) x 59mm sizes, along with a Rapidaptor bit holder. It is ideal for mobile repair and assembly work.