Hammers/Chisels One of the most common causes of hand injuries is from the improper use of hammers and chisels. Both are responsible for a high number of eye injuries as a result of flying nails, metal or concrete chips. Guide for Discussion Chisel Use Never use a chisel with a mushroomed head. Always wear eye protection. Hold the chisel between the thumb and forefingers – don’t make a fist around the chisel. Do not grip a chisel if your hands are numb. If another worker is nearby, place yourself between the other worker and the chipping area. Always use sharp chisels. Hammer Use Use...