Ideal messenger removal & jacket slitting tools for round, figure-8 aerial ducts Tension-spring design closes tool to increase safety & prevent injury Handles feature yellow, plastic-coated grips for greater leverage Tool heads match messenger sizes MJ & MW models have a locking latch to make slitting easier Blades are replaceable Made in USA Application: Jacket Slitting Duct Manufacturer: Pyramid Nominal Duct Messenger Size: 6.6 mm Max Messenger Duct Covering OD: 0.40" Replacement Blade Number: 80639 Handles: Cushioned Non-Slip Grips Length: 6.5" (165 mm) Weight: 9 oz (255 g) Replacement parts/blades: Miller Replacement Blade For 305-Series - MJ Slitting Miller 305-6MJ-P6 Figure-8 Duct Slitter - Pyramid Jacket Slitting 80640