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- Converts torsion spring mini mills to air spring
- Allows travel to the top of the column
- Provides better support for the mill head
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- A handy tool if with you require precise drilling on round stock.
- Works on stock up to 35mm (1 3/8")
- Made of hardened steel - 48-52 HRC
- Overall length 80 mm (3-9/64")
- Shank length and diameter 9.5mm (3/8")
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- Includes boring head, R8 shank, and 4-piece indexable boring bar set
- The boring head offsets up to 5/8", dial is graduated in 0.001"
- Minimum bore diameter is 7/16"; Maximum boring diameter is 5.906"
- Maximum boring depth is 2.5"
- The included indexable boring bars come with TCMT 21.5 C6 carbide inserts for steel and alloy
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