Toolkit Large High Speed Steel Step Drill Set (3 Pieces) STRONG STEP DRILL BITS: Our ultra durable drill bits are stronger and more reliable that others because they have been crafted to withstand regular usage. EXPERT DRILLING PRECISION: Use the pieces as drill bits for steel, drill bits for aluminum, drill bits for fiberglass or drill bits for PVC. To further simplify drilling, these cone-shaped drill bits can be used to drill 15 different sizes of holes FLUTED STEEL DRILL BITS: The double-fluted design of the step drill bits ensures accuracy and delivers optimum speed, making the drilling of thin metals easier than ever before. Use them to drill copper, aluminum sheets or PVC tubing as needed. TIN-COATED DRILL ATTACHMENTS: Each of the (3) step drill bits included in this drill bit kit have been coated in tin to make them durable and dependable. INCLUDES STORAGE POUCH: These step drill bit kits come with a small storage pouch that is outfitted with three separate compartments for the proper storing of your new drill bits.