Vintage steel brake-lathe boring or cutting bar with a graduated micrometer-style adjustment collar and articulated rectangular cutter-holder head. The head is clearly stamped 4901, transcribed exactly from multiple close photographs. The assembly is approximately 6 inches long in the ruler views and includes the retained adjustment and cutter-positioning hardware shown. Fit / compatibility: No maker name is visible, and an exact catalog cross-reference for 4901 was not established. The stamp is presented only as a visible reference, not as a verified OEM part number or an expanded number. Compare the 4901 mark, bar diameter and length, collar, head and mounting geometry to the intended brake lathe. Only the exact pictured item is included.
