Clauss 18430 Titanium Bonded Aviation Snips - Straight
Center cut, Titanium-bonded avaition snips will bite through sheet metal quickly and easily.  The blades are 3x stronger than steel alone and will stay sharper, longer.  Serrated blades will prevent slip-out.  Sturdy handles and pivot points.  Also available in right and left cut and are color-coded for quick identification.  Lifetime Warranty.