1/2" Collet for Beall Collet Chuck and many others.

• ER32 Standard Collet
• Hardened Spring Steel
• TIR: .0006" or less
• The collet has a collapsing range of .039" (1/32")
• The size of the collet is the largest size it can hold.  DO NOT use anything larger than the marked size in the collet (stretch the collet).  It is designed to collapse, not expand.