Klein Tools Serrated Duct Knife is perfect for cutting duct board and flexible duct. The stainless steel blade is dual-sided: 1-serrated and 1-regular for added versatility. Knife comes with a puncture resistant nylon sheath. Specifications Blade Length: 5.5” (14 cm) Overall Length: 10.781” (27.4 cm) Blade Material: Stainless Steel Handle Length: 5.281” (13.4 cm) Weight: 8.5 oz (241 g) UPC: 092644761010