SAFETY TIPS Strike squarely with the hammer striking face parallel with the surface being struck. Always avoid glancing blows and over and under strikes. When striking another tool (chisel, punch, wedge, etc.), the striking face of the proper hammer should have a diameter approximately 10 MM larger than the struck face of the tool. Always use a hammer of suitable size and weight for the job. Never use a striking or struck tool with loose or damaged handle Discard any striking or struck tool if tool shows dents, cracks, chips. Never regrind, weld or reheat-treat a hammer.