The US PRO 3pc Countersink Set features 5-flute countersinks with a 90° chamfer, designed for precise sinking of holes into soft metals and wood. This set is perfect for preparing countersunk screws and fixings. Key Features: Material: Hardened for durability Application: Suitable for soft metals and wood Specifications: Sizes: 12mm, 16mm, and 19mm Flutes: 5-flute design for efficient cutting Chamfer: 90° angle Shank: 1/4" Hex shank Shank Length: 22mm Lengths: 12mm Countersink: 42mm long 16mm Countersink: 45mm long 19mm Countersink: 48mm long