11pc ER32 collet set : 1/8" - 3/4" by 16th (1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4"). For machining tools such as end mills, drill bits, reamers, etc.
All collets are made of high quality alloy spring steel. 0.0005" accuracy.