General description 3pcs 90 Degree 5 Flute Countersink Drill Bit Set designed for wood and metal applications. This set includes drill bits with a hexagonal quick change shank, making it easy to switch between sizes for efficient work. Technical specifications Sizes: 12mm, 16mm, and 19mm Shank type: 1/4" hex quick change Material: Carbon steel Flute design: 5 flute Usage This countersink drill bit set is ideal for: Boring 90-degree holes in wood and soft metals Preparing for countersunk screws and fasteners Cutting into soft metal, wood, rubber, plastic, and other machinable materials Applications in carpentry, locksmithing, automotive, and metalworking