The IRWIN Blue Groove 4X has been designed for fast wood drilling applications and is 4x faster than standard flat bits. The double cutting spurs deliver cleaner holes with minimal breakout. The thicker Blue Groove point and cutting edges offer faster chip removal and longer life whilst drilling. The 1/4″ quick-change shank saves time changing bits and reduces slippage in standard chucks and is compatible with 1/4″/ 6mm quick-change chucks. Ideal applications. Perfect for drilling fast and accurate holes, great for making access for wiring, pipes and general carpentry.