The dch254m2 18v 40 ah cordless sds heavy duty 3 mode hammer drill from dewalt is a professional standard top quality tool ideal for a vast range of applications involving an array of materials powered by dewaltrsquos long lasting and powerful 18v xr lithium ion battery technology the dch254 operates at a maximum speed of 1200rpm and produces up to 4500 blows per minute meaning it can drill anchors and fix holes into concrete brick and masonry at depths between 4mm and 24mm with ease