CS Unitec Double-face Machinists’ Hammer, Aluminum Bronze CS Unitec Double-Faced Machinists’ Hammers are a part of CS Unitecs Non-Sparking / Non-Magnetic Safety Tool Line. CS Unitec Double-Faced Machinists’ Hammers feature drop forging that ensures a long tool life and are now provided with Nupla handles which are twice as strong as fiberglass and 10 times stronger than wood. CS Unitec Double-Faced Machinists’ Hammers are available in Aluminum Bronze. Double-Faced Machinists’ Hammers are commonly used in forging metal and striking wood, but because it is non-sparking, non-magnetic, and corrosion resistant it makes it an ideal tool for any job.