Breynet Countersink Drill Bit Set for Wood Quick Change, 1/4'' Hex Shank 90 Degree HSS 5 Flute Countersink Drill Bit Set 6mm-19mm with Automatic Spring-Loaded Center Punch Tool Set

Features:auto center punch ? Push down to create a impact hammer to the point. ? Used to dimple metal for marking and making a dimple to start a hole to drill. ? Adjustable by screwing cap in and out. ? Can be used to break glass/window in an emergency. Hss countersink drill bit: Material:High Speed Steels 6 Different Diameter Sizes: 6mm(1/4''), 8mm(5/16''), 9mm(3/8''), 12mm(1/2''), 16mm(5/8''), 19mm(3/4''). Quantity: 1Set(6 Drills) Length:48mm/1.88'' Note:This product is suitable for the wood and plastic plates and other hardness of the plate chamfer openwork, do not use this product on the metal chamfering and other processing!