Designed to create windows in ducts and heavy-duty cables, this ratcheting cable slitter is the perfect tool for slitting and ringing cables or ducts greater than 25 ;mm in diameter. This duct slitter features the following: Unique blade penetrates duct walls up to 5 mm thick, allowing you to make mid span window cuts in cables and ducts Fixed jaws and ratcheting feature make it easy to grip and slit heavy-duty cable Slits and rings cable made of PVC, PE, rubber, and other jacket materials Replaceable double-ended blade has an adjustable cutting depth of 0 to 5 mm (0 to 0.20) 10 mm, 20 mm, 30 mm ruler marked on tool for accurate and precise slitting lengths Perfect for mid span or end cable slitting and ringing