Feature: 1. 4Pcs in 1 Set: Including 4pcs cutting heads, often used in automatic glass cutting machines to replace old or broken cutter heads. 2. Tungsten Steel Wheel: The blade wheel is made of hard tungsten steel material, with high hardness and not easy to crack. 3. High Carbon Steel Gasket: With widened and thickened high carbon steel gasket, has good stability and safer operation. 4. Alloy Cutter Shaft: Bold alloy cutter shaft is firm and strong, rolling smoothly, and more flexible when cutting glass. 5. Standard Production: With reasonable size and standard manufacturing, the cutter wheel is easy to replace and install. Specification: .Item Type: Glass Cutter Head Product Material: Tungsten steel + high carbon steel Product Quantity: 4pcs Product Height: Approx. 21mm / 0.8in Product Diameter: Approx. 4mm / 0.2in Cutter Wheel Angle 145° 155° Cutting Thickness Approx.4-6mm / 0.16-0.24in Approx.6-12mm / 0.2-0.5in Package List: 4 x Cutter Head Note: 1. Glass cutters cannot cut high hardness objects such as tempered glass, vitrified tiles, marble, and quartz.2. Do not use on uneven glass. Do not operate directly on window, wall, or facades, but must be placed on a flat ground or desktop to operate.3. When cutting the mirror, you must scratch the front of the mirror.4. Please use broken glass to practice before using it.