DETAILED SIZE20pcs carbide drill bit set with 1/8 (3mm) shank diameter and 1/4 (6mm) head diameter, which includes the most popular used shapes, there is always one type that meets your needs.POPULAR CUTTING STYLEThe carbide cutters are made of high-quality materials, which are durable and long-lasting. carbide/aluminum are generally used in ferrous and non-ferrous metals, aluminum, mild steel and also for all non-metallic materials, such as plastic and wood.MORE PROFESSIONAL It is generally used for cutting, shaping, grinding, polishing and removing sharp edges, burrs and excess material (burrs).EASY CUTTING Designed for fast material removal with minimal chip load, prevents the accumulation and overheating of iron chips that damage the cutting head.APPLICABLE DRILL It can be worked with most grinding machines and engraving tools, such as Dremel, Proxxon, Mister Tool, Einhell and similar machines.Material:High Speed SteelPRODUCT DESCRIPTIONCutting Head Material: new raw tungsten carbideShank Material: Stainless SteelQuantity: 20pcs/setShank Diameter: 0.118 inch (3mm)Cutter Head Diameter: 0.236 inch (6mm)TIPS:1. Need to be fixed during use.2. The cutting shape is better with conventional milling to avoid mutual feeding.3. Prevent flying debris from working, wear safety glasses.4. There is oil in the head.5.Please allow 1-5mm errors due to manual measurement. The color of the item shown in the photos may appear slightly different on your computer monitor since monitors are not calibrated same.