Features Good Material The application of high-quality high-speed steel material, which is rust-proof and very durable for long-term use. Better Design The non-slip knurling design provides you with extra grip for a comfortable hand feeling and more working accuracy. Wide range of uses: for positioning on steel, iron, PVC, etc., as well as for furniture assembly, machine maintenance, etc. EASY CARRYING Comes with a light weight and compact size, convenient storage and carrying make outdoor work easier. Total 4 pieces: the set contains 4 grains, and the large quantity will meet your different work requirements. Specification: Item Type:Grains Material: high-speed steel. Shaft diameter: approx. 12mm Stamp diameter: approx. 4 mm / 0.16 inches. Grain total length: 5 inches. Package list: 4 x centre punches. Small note: Pay attention to safety protection when using. Package List 4 x Center Punch