5pcs HSS Titanium Step Drill Bit & Automatic Center Punch

Made of premium quality high speed steel with titanium coating. Automatic center punch delivers a high-impact and spring-loaded strike. Coated by titanium, performs well in heat, corrosion and rust resistance. Equipped with aluminum case, convenient to store and carry around. For drilling holes in plastic, aluminum, copper, wood and other types of material. Specifications: Model: 5PC-STP, Made of HSS Steel, Titanium coating, Split point: X-shape with 135 degree, Set weight: 19.5oz or 553g. Drill bit sizes: No. 1 1/4" to 1-3/8" 10 Steps, No. 2 3/16" to 7/8" 12 Steps, No. 3 1/4" to 3/4'' 9 Steps, No. 4 1/8" to 1/2" 13 Steps, No. 5 3/16" to 1/2" 6 Steps. Please note: To prolong the lifespan of the bits it’s suggested to drill with oil in order to keep the temperature under control while drilling into hard surface like steel. Package Includes: 5pcs step drill bits, Automatic punch tool, Aluminum storage case.