Adjustable Countersink Drill Bit, Self-Adjusting Depth, 1/8"X5/16"(3X8Mm). Product Features ?Depth adjustment does not require a wrench? - It is an easy, quick and accurate tool to adjust the depth by turning the knurl by hand without a wrench. We made these woodworking tools in Korea; Ezenkorea adjustable depth countersink drill bit. And we have gotten a patent in five countries; the United States, Korea, Japan, China, and Taiwan. ?To Prevent Scratches On The Surface? - After processing the wooden hole, Ezen countersink bit only goes into a predetermined depth, so anyone can work stably. In addition, even if the drill continues to spin, the built-in stopper does not turn, thereby preventing scratches on the wood surface. This ezen countersink adjustable drill bit is the best product to drill diagonal and straight lines. ?Quick Set Up The Wood Working Depth? - Depending on the finishing depth of the screw work and the thickness of the wood, you can set the work depth as fast as desired. The hole depth of wood can be kept constant. This is an advantage of our product that cannot be found in other wood working tools and equipment. ?Replaceable Center Bit And Body? - To replace the countersink body or to reassemble the product after disassembling, rotate the retaining ring and connect it to the body. Then rotate until the marked line at the end of the ring is visible and align the bolt holes and marked line. Lastly, tighten the bolt. When you completely remove the set bot and then re-tighten, make sure to. ?Outstanding Control Range And Depth? - Compared to other companies, the stopper control range is longer. The stopper control range is 2.5mm (0 3/32 in) to 23.5mm (0 59/64 in). It is possible to work up to 39 mm ( 1 17/32 in) by separating the stopper and transforming it into a long type. ? Please use the standard 3mm and 4mm for the center bit. (Do not use products larger than 0.118"/3mm and 0.157"/4mm sizes.) 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!