【Drill Chuck】 Drill chuck has high precision, capable of securely holding the drill bit, thus preventing it from loosening or escaping during high-speed rotation. It ensures perfect alignment between the accessories and the chuck, making rotation smoother and increasing work efficiency. 【4000】 Drill adapter is designed in one piece, made of alloy, durable and reliable. Chuck for sds plus is carefully crafted with a strong and durable built-in spring. 【Bit】 The quick-change design of the sds adapter is convenient and unique, eliminating the complexity of traditional drill bits. Accessories can be changed quickly and easily. The keyless design of the Dremel accessories simplifies the changing process without the need for special tools, reducing interruptions when using cordless screwdrivers. 【Accessories】 The set includes 2 drill chucks, compatible with multi-function rotary tools models 4000, 400, 3000, 398, 395, 300, 285, 275, 200, 100, 8200, 800, 780, 770, 7700 and 750. Note that the