7-Piece combination tapping drill bit set by Wera in a stable plastic box. ¼” drive suitable for holders.Comes with Rapidaptor quick-release chuck for insertion in the power screwdriver or the chuck of the electric drill. The hexagonal shaft ensures very good power transfer. Hss = high speed steel. A finely-tuned material elasticity provides for great durability. Very good centering properties. Easy cutting. Perfect chip removal. Low tilt Risk. Precise return movement.