I ordered a three piece bit set ( stile, rail and panel) that have 1/4" shanks. I also ordered a 1/4" collet for my Hitachi TR12 router ( 1/2"). The 1/4" collet was received in a plastic package printed with Hitachi, part number, TR12 and 1/4". It also has "Made in Japan". There are English and Japanese writings. I feel confident that it is a factory part. The 1/4" collet slides freely , but not loose, within the router's 1/2" collet. One of the bits with a .250" shank will not fit into the 1/4' collet. The other bit with a .2475" shank goes freely into the 1/4" collet but the 1/2" collet will not tighten enough to hold the bit. At maximum tightening, the .2475" shank bit slides easily out of the 1/4' collet. I'm not sure that it matters but the open slot of the router 1/2" collet was matched to the open slot of the 1/4" collet. So my question is what should the tolerances be for the bit shanks?. What should the measurements be? Is it possible that the 1/4" collet is not to specs?