Couplers

Made of low carbon steel
Easy to drill
Stronger than cast iron
Can be welded
Made from lost wax castings
Two drill dimples cast on top of the coupler - one in the shank for the frame mounting bolt and the other above the drop latch for fastening a hook onto the drop latch. This is for top release type couplers if desired
Shank measures 15/16 inches wide by .725 inches high for easy mounting into a rectangular tube frame.