China 20mm Standard Square Straight Tungsten Carbide Replacement Knives Cutter Inserts 20mm X 12 X 1.5mm for Woodworking Spiral Helical Planer Head and DIY Wood Lath, Find details about China Carbide Insert Knives, Carbide Insert Cutter from 20mm Standard Square Straight Tungsten Carbide Replacement Knives Cutter Inserts 20mm X 12 X 1.5mm for Woodworking Spiral Helical Planer Head and DIY Wood Lath