The cylindrical shaft (custom drill bits)
The absolute minimum: 0 % of its contour consists of surfaces designed for firmer chucking. So optimum transmission of the torque is not possible.
The shaft tends to slip in the chuck, where the diameter of the shaft is smaller than the diameter of the working part of the tool (especially in the case of tools such as roughing drills, step drills or countersinks).
ROTASTOP® – Strength from the contour
The contour of the ROTASTOP® tool bit ensures improved transmission of the torque; ROTASTOP® practically chucks itself automatically, by means of the rising contours.
No slipping in the chuck, and precise results.
ROTASTOP® allows easy tool changing and longer service lives for the tools.