The IRWIN Blue Groove 6X Stubby 5 Piece Set has been designed for fast wood boring applications and is 6x faster than standard flat bits. The stubby bits are ideal for drilling in tight spaces. The three cutting spurs deliver cleaner holes with minimal breakout. The full screw tip enables easy pull through and added accuracy. The tapered tri-flute design provides faster chip material ejection, less binding and ease of use. The bits have been fully heat treated for added durability. 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. Set includes 16, 18, 20, 22, 25mm bits and extension.