Carbide wheel tip, plastic/metal shank Supply spare head to replace Cut life: 8,000 -10,000 meters Glass Cutter Fixed with high quality tungsten carbide wheel in the glass cutter, and widely used in flat glass, stained glass etcSpecification for your ref: Product NameGlass CutterFeaturesOil Feed DesignMaterialPlastic HandleMetal HeadCarbide Wheel BladeSize~7" x 0.6'' (L x W)ColorClear white, ...