Union Butterfield 4588N9 taper pin reamer, No. 9 size, High Speed Steel (HSS), 4 flutes, 0.6066" connection diameter, ANSI standard. Part number 5011172. For precision reaming of tapered pin holes.

Taper pin machine reamer with left hand fast spiral flutes and a cylindrical shank, large end diameter 0.6066" with an overall length of 8.5/16", a flute length of 6.1/16" and 0.4800 small end diameter, according to ANSI standard for reaming pin holes with a 1:48 taper into which number 9 taper pins will fit, HSS with bright finish for machining free machining and plain carbon steel, grey and malleable cast-iron, wrought and cast aluminium and copper or copper alloys.