One piece that does it all. Drill, countersink and countersink in one operation. A reaming drill bit is a high-quality solution when you need to drill, countersink and countersink a hole quickly and accurately. Product Description 82° Thread Standard With the fact that almost all woodworking screws used in USA and Canada are 82° angle, 82° countersink this tool set makes all the surfaces of the screw head contact the wood at the same time and with equal force. You won't have to force the countersink length by redirecting the bolt. Self-clearing drills are precisely matched to the countersink sleeve and Two chamfered flutes enable faster work and self-cleaning chip drilling, Making perfectly aligned and shaped holes. Adjustable Countersunk Hole Also Timber Countersinks-The adjustable stop allows you to adjust the depth of countersinks and adjustable cutters can be adjusted for many bolt sizes. Perfect your carpentry2-in-1 design turns a two-step recess into a one-step operation. It can make perfect countersink holes for both set and connected screws, without splitting wood and using neat designs with drill sets. Sharpness, Accuracy and ConcentricityThis precision countersink with properly centered drills, adjustable countersink and sharp point tip, allows for extremely high accuracy and prevents marking of the workpiece. Our reaming bit drill bits have been extensively tested to ensure the highest possible quality. Double the life of the toolThis kit comes with additional 5-inch 3/8'' quick-change drill bits that can be adjusted and removedEasy to clean, sharpen, and replace. Worn or dull drill bits can be easily replaced. The HSS used in this set is by far the most popular drill material praised for its strength, wear resistance and good cutting edge retention. Wide ApplicationComes with 5 pieces of interchangeable drill bits as a bonus and covers a full range of screw sizes. Countersinks are ideal for bench drill, hand drill, and conventional electric drill, ideal for wood, fiberboard, particle board, plywood, plastic, pvc, rubber, etc. TipsMake sure you drill straight consistently to avoid the drill bit breaking, and select the drill bit and exit the hole to avoid loading the drill bit with chips. It is recommended to use the center punch to set the starting point, preventing the drill bit from wobbling on the workpiece. Whenever smoke develops during drilling (usually happens when drilling on hardwood), you should stop and remove the chips from the drill bit. You may need to stop and clean it several times. The best practice is to adjust all settings (drill size, countersink size, depth stop location) and make a test drill on a piece of scrap before drilling the real workpiece. SpecificationComponents Included 5 Reaming Bit #6 (3/8''), 02 Extra Tapered Drill Bit, 01 Alloy Flange, 1Hex Wrench and 1 Safe Container Product Weight 5.3oz Material M2 High Speed Steel Tapered Drill Bit, Carbon Steel #45 Countersinking Cutters Size #6 (3/8 Cutters), 9/64 (Tapered Pilot Drill) Specific Product Applications, Countersinking Wood and Flat CountersinksWarm Advice: Dear buyers, due to the lighting effect, monitor brightness, manual measurement, etc., there may be slight differences in color and size between the picture and the actual item. Sincerely, I hope you can understand this! Thank you!