Vintage black Bakelite Daca-Ware toggle knobs. Set of 4. The items are in very good condition, one has an indicator mark. The largest knob is 2 1/2 in long and 5/8 in tall. The 3 smaller knobs are 1 5/8 in long and 5/8 in tall. Each has 2 set screws in 1/4 in Brass sleeve. Heavy duty.  These were used on early radios and test equipment. Commercial and military grade.