A collet is the metal band used in the production of celluloid buttons It is what holds the paper and protective celluloid covering to the metal disc that makes up the button
A type of chuck that holds very tightly and does not mark the workpiece Collets are made in every standard bar stock size and are designed for holding round, square, or hexagon stock
A special kind of chuck that holds the bit more completely around, but has a more limited range, for example 1/8" +/- 1/32" or 1/4" +/-1/16" Most often used when bits are prepared in specific shaft sizes and precision of holding is needed Router bits commonly come in 1/4" or 3/8" and a router may be supplied with matching collets or only one