Festool 500174 ZOBO Forstner-Style Bit Set, Imperial Machined from the high quality steel, ZOBO bits are dead-on precise, featuring interchangeable pinpoint and pilot bits for precise holes at any angle Designed to plow through dense materials with ease, ZOBO bits feature highly efficient chip ejection so they clear their own path Rapid chip removal prevents overheating, keeping your bits sharper longer Hard-wearing steel can be sharpened up to 30 times, so your investment lasts a long, long time