Feature:1. TUNGSTEN STEEL ALLOY MATERIAL: Made of premium tungsten steel alloy material, these drill bits are strong and wear resistant for long term use.2. RUST RESISTANT: This set of countersunk drill bits adopts surface spraying treatment to prevent rust and oxidation.3. 5 SET: There are 5 pieces countersunk drill bit and 5 pieces wrenches of different sizes in the package that you can use them to meet your different needs.4. EASY STORAGE AND CARRYING: This countersunk drill bit and wrench set can be put in a box for easy storage and carrying, neat and not messy.5. FINE WORKMANSHIP: Well crafted with fine appearance and clear threads, these drill bits works efficiently, choose with confidence!Specification:Item Type: Tapered Countersink Bit SetProduct Material: Tungsten Steel AlloyApplication: Suitable for wood, aluminum alloy screws, countersunk head screws, etc.Shank Size: Approx. 30 x 8mm / 1.18 x 0.31in .Package List:5 x Drill Bit 5 x Hex Wrench 5 x Storage Box