4mm/5mm Countersink Bit Screw Set Woodworking Wood Pilot Hole Hex Shank Drill Bits HSS4241 Adjustable Depth Chamfering Function Features: - Precise Countersinking: This countersink bit set includes 4mm and 5mm drill bits, perfect for creating pilot holes and countersinks in wood. - High-Quality Construction: The main body is made of durable 45 carbon steel, ensuring strength and longevity. The HSS4241 drill bits offer exceptional hardness for efficient drilling. - Adjustable Depth: Equipped with a drill sleeve and adjusting screws, this set allows for easy depth adjustment, enabling precise and consistent drilling depths. - Convenient Chamfering: With its built-in chamfering function, these bits not only create countersinks but also provide smooth and clean chamfered edges for a professional finish. - Easy to Use and Durable: The hexagonal quick-change handle ensures easy bit changes, making it convenient for woodworking projects. This set is designed to be durable, providing reliable performance over time. Specification: - Material: High-speed steel - Shank type: Hexagon - Hexagonal Quick-Change Handle with Drill Sleeve - Stop Drill Sleeve with Adjusting Screws - Chamfering Function - Optional Size: 4mm/5mm/4mm+5mm Package Included (optional): - 4mm: 1 x 4mm Countersink Drill Bit, 1 x Wrench - 5mm: 1 x 5mm Countersink Drill Bit, 1 x Wrench - Set: 2 x Countersink Drill Bits (4mm+5mm), 2 x Wrench