Highly durable carbide long lifegood wear resistance 2 cutter standard 2 flute u shape standard lifetime good dust removal suitable for drilling holes in concrete masonry limestone natural and artificial stone hammer resistant heavy duty drill bit manufactured to iso 5468 for all impact drills suitable for drilling holes for fixings drill bit colour silver grey sand blasted pack of 1 16 x 550 x 600 mm d 12 3 mm