Made from Acetyl and allows you to turn you own chuck jaws for whatever diameter is required to hold the work piece. Once screwed to a chuck, simply turn the Acetyl Jaws for each job required using turning chisels.
The sizes indicated on the drawing are when the jaws form a perfect circle, which is achieved when the jaws are 2mm apart. VM90 and VM100 chucks provide approx 38mm of expansion beyond these specified sizes.
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