SB Adapter Sleeves fit into the Taper-Lock Tool Handle Bolster, and are offered in different sizes to fit almost any round woodturning tool. The bolster has a 3/4" opening, but if you have a smaller tool you will need an adapter sleeve. This sleeve will accomodate a 1/2" diameter tool. The tool is glued into the sleeve, then the sleeve is glued into the bolster. You can then quickly switch any tool mounted into a bolster between any length Taper-Lock Handle.