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> New 4" boring head for bridgeport adjustable-
New 4" boring head for bridgeport adjustable-
* For convenient interchangeability, threaded back
* To provide optimum precision, rugged construction and maximum bearing surface between the sliding gib and the body
* Overrall length held to a minimum
* When locked in place, it holds firmly against tool-cutting pressures
* 2 vertical and 1 cross hole extra large boring range
