The 4635-1032-AL from RAF Electronic Hardware is a threaded hex standoff with #10-32 thread, made of aluminum, 1.188" (30.16 mm) long, 3/8 hex size, 1-3/16 length.
The 4635-1032-SS-20 from RAF Electronic Hardware is a stainless steel hex standoff with a #10-32 threaded end, 1.188" (30.16 mm) long, 3/8" across hex.