The drill bit is made of HSS titanium coating and the black chamfer part is made of steel, offering high hardness and portability. It is suitable for drilling hardwood or any wood products. The length of the drill bit can be adjusted for different lengths using the L-wrench. Designed to discharge sawdust faster and easier during the drilling process. The 5-piece set includes bits for drilling holes for various screw sizes. This set is ideal for creating countersinks or chamfers. The cone-shaped bit allows for more convenient and faster drilling. Provides smooth countersinking for screws or nuts. Features: - Efficient sawdust discharge during drilling - Suitable for hardwood and other wood materials - Adjustable length for versatility - Durable HSS 4241 titanium-coated drill bits - Black chamfer body made of 45 steel - Round shank size: 1/4 inch Specifications: - Drill Bit Material: HSS 4241 Titanium Coated - Chamfer Body Material: 45 Steel - Round Shank: 1/4 inch - Dimensions: - 6 mm: 2.38 mm - 8 mm: 2.78 mm - 10 mm: 3.175 mm - 12 mm: 3.56 mm - 14 mm: 3.97 mm - Weight: Approximately 70g Package Includes: 5-piece drill bit set