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All 6 surfaces are qualified,
ground flat, parallel, and perpendicular to adjacent surfaces.
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Location of bushed holes is held
accurately with respect to edges.
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All 8 bushings are pass-thru
bushings, allowing stacking. Doweling them together assures that
bushing true position is maintained and that all edges will stay
in same plane.
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Pass-thru bushings have spring
retainer, preventing dowels from dropping through unless pushed
through.
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Material: Alloy steel, case
hardened to 60Rc.
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