All Elaire Corporation Router Collets are completely interchangeable with OEM collets..

Are router collets standard?

You can get most types of router bits in either a 1/4-inch or 1/2-inch shank. Smaller routers often use a 1/4-inch collet. Larger ones can usually accept both sizes.

What size are router collets?

Ellis Walentine: Many routers come with two collets so they can accommodate the two most popular bit shank diameters, 1/4" and 1/2". The shank diameter is based loosely on the size and weight of the bit. Heavier and larger-diameter bits have 1/2" shanks, to protect them against bending or breaking during heavy routing.