Crescent Wiss tradesman aviation snips are made for pros and made to last. This updated snip is an extension of our market-leading and performing core lineup of snips. Tested to deliver over a half-million cuts. 10-times the life of the competition and enough to complete over 700 residential HVAC system installs. The blades are coated with a black oxidation treatment to further improve the life of the tool by decreasing rust and corrosion.