Use this set with an air hammer to dislodge stubborn parts. The soft brass punches wont damage other metal surfaces. Also, it wont spark. Two head diameters cover most applications. Works great for driving bearings on and off transmission and axle shafts, driving door pins, knocking pins out of chain linkages, replacing U joints and carrier bearings on drive shafts. Note: The brass drift punches are perishable and are not warranted. Redress punches as they mushroom with use.