Modern Roofer™ Knife Favorite tool of professional roofers for over 75 years. Features original Bow Tie U-102 Modern Roofer blade, which easily store in handle. Very versatile, the knife will accommodate all Modern Utility center hole blades. Professional quality, constructed of heavy gauge, zinc plated steel to prevent corrosion. Each handle includes four of our Original Bow Tie U-102 blades. Replacement Blades can be ordered here... U-102 Blades