Rokrou Countersink Drill Titanium Set - Premium 11PCS for Perfect Drilling Results Review

【Countersink Drill Bit Set】Countersink drill bits held in place by pins will stay firmly in the shank and will not loose easily. At the same time, the countersink bits are wear-resistant and tough, so they can be drilled without difficulty even after many uses. 4 cutter #45 Carbon Steel; featuring 5 pieces of countersink drill: #4 (7/64 inch), #6 (9/64 inch), #8 (11/64 inch), #10 (3/16 inch), #12 (7/32 inch). Hex Key (Allen Wrench) included. 【Drill and Countersink in 1】Tapered drill bit produces a tapered hole for a better screw grip. Adjustable 4-blade high-carbon counterbore with 82-degree sharp blade provides a speedy drill when drilling holes. 【Preminum material and coating】The upgraded product is made of M2 HSS(High-Speed Steel), drills of this material last three times longer than ordinary 4241 HSS. The drill bit is titanium-plated to further boost its toughness and resistance to corruption. 【Adjustable Depth Stop Collars】Counterbore attaches to the shank with 2 hex screws can be adjusted for controlled pilot hole depth; Adjust with the hex key included to the depth you want. 【Hex shank Impact ready】Universal 1/4 inch hex shank prevents slipping in standard chucks and they are compatible with all 1/4 inch quick-change chucks, including impact drills of Dewalt, Bosch, Black&Decker....