Toolant Four Spiral Flute Cobalt Step Drill Bit Set, 1/8″-7/8″(3pcs) Impact Ready Four-Flute Step Bit, 1/4 Hex Shank Unibit Step Bit for Metal, Stainless Steel, Aluminum, Wood, Plastic. FOUR SPIRAL FLUTE – Four cutting blades design guarantees a faster and smoother cutting, allows swarf escape easily. TiAlN COATING- With 89HRC surface hardness, harder materials can be cut and higher cutting speeds can be achieved. M35 COBALT HSS STEP DRILL – Prefect for Stainless Steel/Metal Sheet/Wood/Plastic/Aluminum Sheet/Copper and other metal sheets. 34 TOTAL STEP SIZE – Includes 3 bits with 1/8″ – 1/2″, 1/4″ – 3/4″, 3/16″ – 7/8″. Please wait for the result of cancellation. The order will be processed and completed by automatic warehouse system within 5 minutes. Sending direct message to cancel the order is not allowed for every case. For the return case. We try our best to make sure every customer is completely satisfied. If there’s a problem, feel free to message us! – We’re happy to help.