Precise Compatibility Directly compatible with DW621, DW616, DW616M, DW616P, DW618 and other compatible router models. These chucks serve as direct replacements for part numbers 2610906283, 2610906284, 2610906287, and 32628603. Dual Size Versatility Supplied as a convenient 2piece collet and nut kit, this set includes both a 1/2 inch (12.7 mm) and a 1/4 inch (6.35 mm) option to handle a wide variety of router bit sizes and woodworking tasks. Robust Construction Made from durable metal to provide a secure grip on router bits, minimizing slippage and ensuring consistent performance during demanding use. Easy Installation Designed for straightforward replacement on compatible routers, enabling quick installation and helping you avoid extended workshop downtime. Practical applications Use 1/2 inch bits for edge routing, dadoes, and rabbets where increased stability is needed. Use 1/4 inch bits for fine contouring, dadoing, and detailed edge work that require precision. Perform rapid bit changes during longer projects to maintain workflow and minimize downtime.