Feature:Enhanced Planer Performance: This helical cutter head for Ridgid R4331 ensures a smoother finish, reduces tear-outs, and lowers operational noise, making it suitable for hardwood, softwood, and engineered wood projects.40 Durable Carbide Inserts: Includes 40 tungsten carbide insert knives (15x15x2.5mm) for extended use, providing consistent cutting performance without frequent sharpening.Shear-Cut Technology: The helical cutter head design creates a shearing action, minimizing chip-out and improving surface quality on various wood types.Quick Blade Replacement: Changing carbide insert knives is simple and efficient, requiring no adjustments—ideal for woodworkers and carpenters.Improved Dust Control: Generates smaller wood chips, enhancing dust collection effectiveness for a cleaner workspace.Precision Fit for Ridgid R4331: Specifically designed for Ridgid R4331 13-inch thickness planer, ensuring easy installation and optimal function. Specification:Material: Top-quality tungsten carbideMax Wide of Cut: 13 InchCutting Wings: 4Quantity of Knives: 40Insert Knives: 15x15x2.5mm Package included:A:1 x 13" helical cutter head40 x Carbide insert knives40 x Screws2 x Screw Drivers1 Pair of bearingsorB:1 x 13" helical cutter head50 x Carbide insert knives50 x Screws2 x Screw Drivers1 Pair of bearingsorC:1 x 13" helical cutter head70 x Carbide insert knives70 x Screws2 x Screw Drivers1 Pair of bearings