Tecos Step Drill 5% Cobalt, M35 steel Centers, drills and deburrs thin materials. Great time saving due to the many steps and dimensions. A uniform and fine grain material structure, the step drill has a minimal risk of breaking the cutting edge. Safe and accurate work as the single-sided cutting edges prevent vibrations. The drill tip grips even on uneven surfaces and is suitable for all common materials - especially useful for thin sheets.