This is a very lightly used Shimano Deore XT FC-M730 drive side crank arm from the late 1980s.

The arm is 175mm long and for square taper bottom brackets.

It is fitted with 28 / 38 / 48 Biopace HP (High Performance) chainrings. These are the standard of the time - 5 arm 74mm / 110mm BCD. 

The rings are in good condition with plenty of life left.

The arm has some shoe rub on the outside faces and some other stone chips and scratches, but is in very good condition for being approx. 35 years old.

The threads and tapers are 100%.  

Thanks very much for looking. Please check out my ebay shop for loads more bike stuff.