Features:  - High-quality materials: Made of high-speed steel, with strength and durability.  - Storage: Packed in a plastic storage box, convenient for storage and transportation.  - Widely used: 135° rapid cutting point is automatically centered and quickly penetrated, with lower pressure, and the drill bit kit meets all your requirements, including all common size specifications of metal, wood, and plastic.  - Process treatment: The titanium coating surface prevents rust, thereby increasing the hardness of the drill bit and reducing heat accumulation, making the twist drill bit more wear-resistant and longer service life.  - Service guarantee: delivery within 30 days, we will serve you at any time within 24 hours.     Specification:  Produce Name: Twist Drill Bit Set.  Material: HSS.  Drill Diameter:  1x 1/2inch, 1x 3/8inch, 1x 23/64inch, 2x 21/64inch, 3x 5/16inch, 2x 19/64inch, 4x 9/32inch, 6x 1/4inch, 4x 15/64inch, 8x 7/32inch, 12x 3/16inch, 12x 11/64inch, 12x 5/32inch, 20x 9/64inch, 20x 1/8inch, 30x 3/32inch, 30x 5/64inch, 30x 1/16inch, 32x 3/64inch.  Quantity: 230pcs.     Note:  1. Please allow slight error due to manual measurement. Thanks for your understanding.  2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.     Package Included:  1 x Box.  230 x Drill Bits