1. Material: cemented carbide 2. Type: angle milling cutter 3. Purpose: used for grooving wood 4. Strong and durable, not easy to deform 5. Small and convenient, easy to carry 6. Diameter of handle: 6.35 mm 7. Weight: about 15 grams 8. The set contains: 1/4''; 1/8''; 3/8''; 1/2''