[Size] Total length: 60mm (12/5'); Shank diameter: 6.3mm (1/4'); Specifications: 3/8, 5/16, 1/4, 3/16, 1/8,3 /32 [Material] High-speed steel wood drill bit, stable performance, sharp, durable, wear-resistant and not easy to break [Efficient] The woodworking drill bit has a three-point design, large-capacity chip flute, accurate positioning, clean cutting, and fast and efficient drilling [Practical] Universal 1/4 handle twist drill bit, compatible with a variety of equipment, suitable for most bench drills, conventional hand drills and other equipment [Usage] The drill bit set is used for drilling holes in various types of wood, plastics, polyester rubber, low-hardness metals, etc. Suitable for home decoration, construction sites, engineering construction and other scenes Set of six twist drill bits for a variety of drilling needs. The rotary drill bit is made of high-speed steel with high hardness, wear resistance and heat resistance, hard and sharp, providing excellent cutting