... /8,13/32, 7/16, 15/32, 1/2" MASONRY DRILL BIT -- MILLED AND SANDBLASTEDMade of high carbon steel with industrial grade carbide ... , rock, stone, masonry, marble and breeze block.Dia.3-26mm/1/8" to 1"Standard Shank, 1/4" Hex Shank MASONRY DRILL BIT ... , carefully made bit, excellent value of money.For use with rotary or roto-percussion drills.For drilling in concrete, rock, stone, masonry ...