Made of hard-anodized aluminum, each collet fits into a recess drilled into the work, and expands to hold it when you tighten the screw in the back of the shaft. The collets also allow stock to be removed and remounted with repeatable concentricity – a factor important for sanding and finishing a workpiece.
The sizes included are 1/2" to 1-1/4" in 1/8" increments, and 1-1/2". Each has a 1/2" shaft for mounting in a chuck. A cherry block is included for storage.
Made in USA.