Concentric Stacked Knob Set, with Set Screws, Chrome.Top Knob - Inside diameter .192", 3/4" diameter, 1/2" tall.Bottom Knob - Inside diameter .272", 1" diameter, 3/8" tall.Concentric pots to fit - EP 4585-000 250K/500K; EP 4586-000 500K/500K
