Features 1、PREMIUM MATERIAL: This countersunk bit set is made of excellent hard alloy steel, HRC50‑54, has high strength and toughness 2、WEAR RESISTANT AND DURABLE: Countersink drill bit provides superior cutting capability, high durability and good wear resistance 3、CONSISTENT DEPTH: Adjustable for screws of varying length, the adjustable countersink bit creates countersink holes in the wood, ensuring consistent depth of countersink holes while protecting the working surface and preventing clogging of debris cavities 4、CLEAN AND TIDY: Countersink drill bits make perfect countersink holes for flat head and plug screws, eliminating the need to split wood and allowing you to enjoy clean engineering with the drill set 5、5PCS IN TOTAL: The package contain a total of 5pcs adjustable countersink bits, enough for you to replace and use, very convenient Specification Item Type: Countersink Drill Bit Set Material: Alloy steel Basic Parameters: Specification: 8x8x4; 8x8x3.5; 8x8x3.2; 8x8x3; 8x8x2.8 Package List 5 x Drill Bit 5 x Set Screw 5 x Wrench 5 x Hex Wrench 5 x Storage Container