UYUSTOOL standard SAE step drill bits can drill 23 different size of holes on different thickness of materials. Made of high quality high speed steel that is hard and sharp enough to drill through wood, plastic, steel and sheet metal. Titanium coated surface can reduce friction and overheat when drilling through material for longer life time. 1/4" hex shank (6.35mm) can be easily fit into power driver,drill and press drill. These drill bits works great in making a smooth, clean and perfectly round hole. This drill bit set includes size 1/4" - 1-3/8", which meet your different needs perfectly. High speed, titanium nitride coated steel Replaces 23 separate drill bits with two fluted design for fast, smooth cutting. Such as carbon steel plate, sheet iron, insulation boards, wood. Cannot be used for stainless steel. When inject cold water while working, can effectively extend the service life of the drill bit. This include: Step Drill Bit Set, Step Drill Bit Specification: Color: Titanium Coated. Material: High Speed Steel. Made of premium material for durable and practical use. Shank :1/4" Hexagonal (6.35 mm). Surface treatment: titanium coated. Tools: Power drill,driver and press drill.
