The Spectrum MS5 Pro 5-Piece. Set is everything you need to get started with dry core drilling in a sturdy, aluminium case. 5 x Drill bits: 38, 52, 65, 117 & 127mm. Spectrum’s first class award winning diamond tools are produced in some of the world’s most technically advanced laboratories and factories, guaranteeing the highest manufacturing quality. The Spectrum brand has revolutionised the market with its innovative and unprecedented performing diamond products, providing the solutions needed at every level of performance and price.