hmm.. i need all the outside dimensions of the collet. the lenght, the diameter of the thinnest part and the thickest part etc.. i know i will have trouble trying to translate measurements in inches to an understandable form, but i guess i have no choice. it seems that there's no accurate measurements of the collet at the official dremel site. i know what collet i need for my router bit, but i don't know if it will fit in the dremel copy i have.. my friend has a black & decker which has much smaller collet than mine, so...