Vintage black bakelite toggle knobs from Daka-Ware. The condition for all 4 items are Very Good, almost flawless.  The 2 small knobs have 1 set screw in a 1/4 inch brass sleeve. All the set screws are original. 1 5/8 inch long  by 5/8 inch tall. The 2 long knobs have a set screw in 1/4 inch brass sleeve. Set screws are original. 2 1/2 inch long by 5/8 inch tall.  Clean and shining. High Quality. I see these on a lot of vintage Test equipment