Countersink Drill Bit Set, High Hardness Alloy Steel Wood Hole Timber Working Product Details Reliable Drilling: The drill bit tip adopts cemented carbide with HRC 50-54 high hardness, which ensures efficient cutting performance.One tool, multiple applications, improve your work efficiency. Adjustable Design: Equipped with drill stop, the counter sink drill bit enables easy adjustment on the drilling depth, meeting your needs,avoid debris accumulation, improve work efficiency. Wider Application: Suits perfectly for wooden boards rather than black metal, such as wood, MDF, particle board, dense plywood and so on.It is suitable for drilling machines with chucks, which can perform precise drilling on wood or wooden floors. It is recommended to perform center punch positioning before use, keep the drill bit vertical to avoid bending or breaking. Great Alloy Steel: Adopting premium alloy steel material, this drill bit that has been through excellent workmanship has great durability.Whether you are a DIY enthusiast, a home user or a professional construction engineer, it can meet your needs. Simple to Install: Comes with a compact size and a light weight as well, the 8x10x3.5 countersink drill bit is very convenient to install.Complete specifications for all your needs. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.