DC Varibore Collets have the same accuracy specification as spring collets whilst maintaining a gripping range of +/- 0.5mm. Supplied with either smooth or serrated gripping surface. Serrated collets are ideal for aggressive first operation gripping ...
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https://www.amada.com/america/brochures/general-fabrication/ID40IV-HP-
NT/html5/index.html?&locale=ENG