when buying any collet ,you must know that each router in the market has a diferent collet system,so it's very important to ensure you identify the correct collet. I have a Kress router,and other than a ISEL router the collets for that are unique.
Trend do a range of collet adaptors. These are simply sleeves that convert a larger hole to a smaller one so you don't have to purchase a lot of collets.They fit into a existing collet say size 8mm and give the user a smaller size (say 6.35mm or 1/4 inch). As they are only sleeves they can be used with any router


For those Kress users I have come across a odd problem,and it's this.
Kress produce collets in sizes from 1 to 10 mm... BUT my router (a 530 model) has a collet chuck nutthat only has a 8.5 mm hole in it,so How can you fit any thing larger .!!!!! You Can't.

I have found that CNC_PLUS in germany can supply collets for most routers at a reasonable price...and only 20 Euro registered postage per parcel.

Robin WERY