These are the three bolt knobs we offer. All are 5/16-24 ID threads. All will interchange across all of our bolts!
The 737 knob is what comes standard on all 737R's, 777R's, and 787R's. It weighs 2.8 ounces
The NBK Knob is what comes standard on all SA, MA, LA, and 787 NBK's, and also the 707R. It weighs 1.5 ounces
The Round knob is an old part that we still keep around on occasion. It weighs 2.5 ounces