General description The 5-Piece Set of 16mm-30mm High-Speed Steel Drill Hole Cutter includes five woodworking openers with varying specifications: 16mm, 18.5mm, 20mm, 25mm, and 30mm. This versatile set is designed to meet various drilling needs. Technical specifications Material: High-speed steel Sizes: 16mm, 18.5mm, 20mm, 25mm, 30mm Quantity: 5 pieces Measurement error: +/- 1-3cm Compatibility and accessories Compatible with hand drills, bench drills, and magnetic drill equipment Other information Upgraded M35 cobalt-containing high-speed steel for enhanced durability High-precision lathe grinding for reduced opening resistance and faster drilling Packaging design allows for easy storage and transport Note: Light reflection and different displays may cause color variations in the product image