4400 16E3 Auger, 16D, 36L, 1.38Hex

Auger bit. Digs a 16 inch nominal diameter hole up to 36 inches deep. Heat treated, alloy steel wear parts are field replaceable.
1-3/8 inch female hexagon auger drive connection.
36 inch effective digging depth.
17-1/2 inch cutting diameter when boring head is in new condition.