Description Irwin 6X Blue Groove Stubby Wood Bits are designed for efficient drilling in wood, offering six times faster penetration than standard flat bits. Their tri-flute design ensures quick chip removal, while full screw tips facilitate easy and smooth drilling. The cutting spurs produce clean holes with minimal splintering, and the tapered flute reduces binding. Made from heat-treated material, these bits are durable and suitable for repeated use. The stubby length of 10cm (4 inches) makes them ideal for drilling through joists or in confined spaces, with a maximum hole depth of 5cm (2 inches). The set includes five sizes: 16mm, 18mm, 20mm, 22mm, and 25mm, and comes with a free extension for added versatility. Specifications Set includes: 5 wood drill bits (16mm, 18mm, 20mm, 22mm, 25mm) Bit length: 10cm (4 inches) Shank type: 1/4" hexagonal (hex) shank Material: Heat-treated steel for durability Design: Tri-flute with full screw tip and cutting spurs Compatibility and