https://www.higherprecision.com/products/collets/gs-tooling-337404-er20-collet-15-piece-set-inch-size-1-0-16-to-1-0-2inch

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GS Tooling ER20 Collet 15 Piece Sets – Inch - Higher Precision

https://www.higherprecision.com/products/collets/gs-tooling-337404-er20-collet-15-piece-set-inch-size-1-0-16-to-1-0-2inch from www.higherprecision.com

$9.99 6–12 day delivery 30-day returns

Features: Size range: 1mm – 13mm (0.039″ – 0.511″); ER20 collets collapse approximately 1/32″ with full accuracy. AA Collets have a runout of only 5 microns ...