This has a spring tongue. The blade is grooved and a small shaft sits inside the groove. The ferrule is a trigger for the shaft GA-6 5 inch 1936 – 1937 GA-5 2 ½ inch 1937
Screw Starters
Screw Starters 1939 The end of this tool chucks tightly into the screw slot with no outside claws to interfere….they provide a grip that will withstand an eight pound pull and automatically released when pressure becomes too great. Light weight Duralumin Handles… high carbon steel gripping bits.