5Pcs Quick Change Adjustable Countersink Drill Bit Set, 8Mm Round Shank 2.8-4Mm Main Features: Product Features Specifications. Woodworking countersink drill bit set for wood screws without changing bits. Drilling length can be adjusted for various length screws simply by loosening and tightening the setscrew. Parameters. 8mm round shank countersink drill bit set included 5 kinds of sizes: 2.8 x 8mm, 3.0 x 8mm, 3.2 x 8mm, 3.5 x 8mm, 4.0 x 8mm bits, very suitable for drilling holes, opening range is 2.8-4mm, and adjustable cutting height: 2.5-10.5mm. Suitable for drilling machines with chucks such as electric drills, hand drills, bench drills, etc. Provides precise, clean pilot holes in compressed board, plastic, MDF, pine and more. Perfect for woodworkers, DIY enthusiasts, home repairs and more. High Quality. Made of 45# steel, carbide tip: YG8, durable and corrosion resistant. Good toughness, wear resistance, strong drilling capacity. Premium Quality Service. All our products are extensively tested to comply with rigorous and strict QC standards. We offer a 60-day refund guarantee. Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!