Windshield Knife, AST1770, Deluxe Air Windshield Knife, $180.95 SALE PRICE, Features and Benefits Tool is counter-balanced for smooth operation which results in less fatigue to the body Heavier and thicker blades last much longer Built-in air regulator 12,000 strokes per minute allows you to cut through urethane much faster Comes with 4", 6" and 8" blades Safety lever - 1 year warranty Replacement blades available:17701 - 4" blade; 17702 - 6" blade; 17703 - 8" blade Manufacturer: Astro Pneumatic 1 yr warranty on material and workmanship