FISCH Wave cutter Forstner bits have been seriously engineered. The bits are forged, before being CNC ground and then hardened meaning; accuracy and sharpness are a premium. The unique Wave cutter design has many benefits compared to a more traditional Forstner. The serrated wave edge generates considerably less heat and allows cutting speeds to be increased with less effort needed to achieve each hole. Metric set includes: 15, 20, 25, 30 and 35mm. Forged from one piece of high quality tool steel for extra strength. Made in Austria. For the best results, use in a pillar drill.