Quantity: you receive 10 pieces of 1/4inch to 1/8inch collet adapters, sufficient quantity to meet your daily use needs, easy to replace. Size: inner diameter 1/8 inches(3.175 mm), outer diameter 1/4 inches(6.35 mm), total length 0.93 inches(23.5 mm). Quality Material: made of spring steel, these collet adapters are well made with high-precision clamping force and good grip stability for long-term use. Application: router collet adapter reduces the collet size from 1/4inch to 1/8inch, suitable for CNC machine grinders with 1/4inch collets; centering 1/4 x 1/8 inch, because it has 3 , just like a milling machine chuck Firmly Fixed: this router adapter can be installed well and stay firmly, no vibration when using, with precise clamping force and good grip stability, can firmly hold the 1/8 inch drill bit in the router Colour:As Shown Material:Steel Package Contents: 10 x Collet Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.