Whiteside Router Collet Reducer 5/16 in. ID x 1/2 in. OD is designed to fit inside a standard 1/2" router collet, allowing the use of 5/16" shank router bits with ease. This reducer features an overall length of 1-1/4" and is made entirely of durable steel, ensuring reliable performance and longevity. Manufactured by Whiteside Machine Company in Claremont, North Carolina, this tool is a addition for precision routing tasks where bit size adaptability is required. Model Number: 6401