3 pcs. Multi Hole Drill Bits With Case HSS Drill Bit For Reaming DrillingOOTDTYComtsy: Premium Materials: Made of high-speed steel and nitriding technology used for increased durability and service life. Easy Drilling: Dual-flute design provides a smoother cut. The high step design allows you to feel the stop and never drill a bigger mistake. Package Included: 3-Piece HSS Step Drill Bit (3-12/ 4-12/ 4-20mm) with transparent box. Hexagonal shaft drives are suitable for all types of DIY home drills. Hex chuck: These multifunctional drill bits are very easy to install, suitable for handheld drills, drills, milling machines and machining centers, etc. Multiple Use: Ideal for drilling holes in steel, copper, plastic, aluminum and other thin materials (the thickness of steel and copper is less than 3mm, and the thickness of other materials is less than 5mm). Ideal for DIY projects, household maintenance and repair. Specification: Material: High Speed Steel Size: Approx. 88x65x2 2mm/3.46x2.56x0.87 inch Color: BlackPackage Included: 3 Piece Step Drill Bit SetNote: 1. Please allow 1-2cm errors due to manual measurement, please make sure you do not mind before ordering.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.