Tungsten carbide-tipped, sand-blasted masonry drill bits for concrete, masonry, brick, block and stone, supplied in a handy, soft-grip storage case. Compatible with all 13mm 3-jaw chucks. Includes 3 x 3, 4, 5mm and 2 x 6, 8 and 10mm bits. Tungsten carbide-tipped, sand-blasted masonry drill bits for concrete, masonry, brick, block and stone, supplied in a handy, soft-grip storage case. Compatible with all 13mm 3-jaw chucks. Includes 3 x 3, 4, 5mm and 2 x 6, 8 and 10mm bits.