This 4mm diameter, 160mm length irwin masonry drill bit offers the drilling accuracy of a 4mm diameter with the extended reach of 160mm, making it perfect for deeper drilling applications in brickwork, concrete and breeze block. Designed specifically for fast and efficient drilling with cordless drills, this bit delivers up to 60% faster drilling than competitive alternatives whilst maintaining exceptional durability. The single flute design ensures faster dust removal for increased drilling speed even at extended depths, whilst the unique pressed diamond-ground carbide tip allows for aggressive cutting action. The carbide tip design ensures 20% longer life compared to previous irwin masonry drill bits. The chrome vanadium body with high carbon content allows more hardening, creating a stronger bit with maximum rupture strength for demanding trade applications. Features and benefits: 4mm diameter with 160mm length for extended reach applications ideal for deeper drilling through cavity walls and thick masonry up to 60% faster drilling than competitive drill bits single flute design maintains efficient dust removal at depth pressed diamond-ground carbide tip for aggressive cutting 20% longer life than previous irwin masonry bits chrome vanadium body for maximum rupture strength specifications: diameter mm : 4 working length mm : 160 overall length mm : 115 pack qty.: 1 Total length: 160mm.