7-Piece-Multi-Use-Drill-Bit-Set-Sizes-4-to-12mm-Faithfull-FAIMCDSET7-p-Faithfull-Multi-Construction-Drill-Bits-are-suitable-for-use-in-most-materials-encountered-in-the-building-industry-They-can-be-used-on-brick-tile-concrete-metal-aluminium-wood-&-plastic-&-are-ideal-for-multi-layer-materials-p-p-The-drill-bits-have-a-diamond-ground-carbide-tip-for-advanced-cutting-performance-&-a-long-working-life-Their-flute-is-designed-for-fast-debris-removal-Perfect-for-use-in-cord