The subject of whether you can use the Lindsay Engraving long collets in the GRS hand pieces and whether you can use the GRS QC collets in the Lindsay collet nose hand pieces has come up from time to time. I did a side by side comparison and, they are fully interchangeable. The Lindsay collet nose handpieces are now made to use a shorter collet so the older long collets require an adapter that Steve makes and supplies with his handpieces.