STROTON 4-32mm Metric 5% Cobalt Step Drill Bit for Stainless Steel and Hard Metal (15 Steps.

（ⅠProduct Advantages : (1 The Cobalt from STROTON ,Add enough rare metals from STROTON to ensure the quality. (2This step drill bit is made of Premium Cobalt (80,000 dollars per ton. (3This step drill bit works in materials such as sheet metal, ducts, steel, copper, brass, aluminum, plastic, vinyl siding, plasterboard, PVC, stainless steel and cast iron. （ⅡSome Important Tips about drilling stainless steel and hard metal : (1Running the step bit at Low Speeds and using a little appropriate cutting fluid (Drillling metalwill extend its service life. (2Adding cutting fluid , engine oil or water to prevent the stainless steel from overheating and forming a very hard oxide layer. It also works adding some vinegar,soy sauce if you dont have cutting fluid. (3Cutting ThicknessStainless Steel Sheet Hand Drill ≤2mm Drill Press ≤5mmMetal Sheet,Pvc,Woodboard and etc Hand Drill ≤5mm Drill Press ≤5mm.