IRWIN Blue Groove 4x Spade Bit 8pc Set

The IRWIN Blue Groove 4X Spade 8pc set has been designed to drill 4x faster than standard flat bits. The increased release angle of 17° and the concaved cutting edge design improves chip removal for faster drilling. The bits are made from carbon steel and have been fully heat treated for improved tool life. The shank diameter has been increased to 10% for increased stability. The set includes 12,16,18,20,22,25,28 and 32mm flat bits.