The overall safety and efficiency of many construction activities depends, to a large extent, on the quality and design of the tools being used. Tools extend the hand's capabilities and often provide a more powerful, efficient method for getting a job done. But repetitive use of a tool that's poorly designed, uncomfortable to hold, or vibrates intensively can result in cumulative injuries. Here are five characteristics to look for in ergonomically designed tools: 1. Reduce awkward postures. 2. Well-balanced. 3. Require minimal grip strength. 4. Easy to operate. 5. Reduce vibration.