Sealey Combination Drill Bit Set 18pc AK5711For use on a variety of surfaces including steel, cast iron, wood, brick and more. Features a mixture of HSS, masonry and wood drill bits. Supplied in cylindrical plastic storage case. For use on a variety of surfaces including steel, cast iron, wood, brick and more. Features a mixture of HSS, masonry and wood drill bits. HSS Roll Forged Drill Bits (x6) (3, 4, 5, 6, 8, 10mm). Milled Flute Sand Blasted Masonry Drill Bits (x6) (3, 4, 5, 6, 8, 10mm).