Our Industrial high precision machined collet reduction sleeves enable collet sizes to be reduced to accept CNC and router bits with smaller shank sizes. Reduction sleeves are produced with high quality steel and precisely machined to limit the chance of run-out. Reducing the sleeve is not a long term solution, for best results using the correct size collect is strongly recommended.#Rb-102, diameter (D): 1/4, shank (D): 1/8, overall length (L): 1, RB-102 High precision steel Router collet Reducer 1/4 overall DIA x 1/8 inner DIA x 1 inch long