As the title says, I have a collet chuck that came with the mill... but I have no idea what sort. Its MT3 taper, can handle anything up to 0.7" (17.7mm) through the nut and the internal opening for the collet in the main body is 22.4mm at the top. The nut is about a 32mm thread. The outer dimensions are 48mm dia and from the top of the nut to the gauge line is 66mm....

Ideas?