Check the listing for details. Small Gray Tektronix TEK knobs, Assorted styles, Sold in pairs. Condition: New – Open box. Listed at 12.95 USD. Pairs of gray Tektronix knobs Sale is for one pair from the list below. Let me know which one(s) you want using the message feature when you purchase. #1B Light Gray, round, 3/8" dia., 1/2" high, 1/16" shaft, white dot on top, one set screw - Available Quantity 2 pairs #3 Dark Gray, round, 3/8" dia., 1/2" high, 1/8" shaft, white dot on top, one set screw, says "VAR" on top - Available Quantity 6 pairs #3B Dark Gray, round, 3/8" dia., 1/2" high, 1/8" shaft, white dot on top - right of lettering, one set screw, says "VAR" - Available Quantity 6 pairs #4 Dark Gray, round, 3/8" dia., 1/2" high, 1/8" shaft, white dot on top, one set screw - Available Quantity 3 pairs #5 Dark Gray, round, 1/2" dia. at base, 3/8" dia. at top, 1/2" high, 1/8" shaft, one flute w/ white indicator line, one set screw - Available Quantity 4 pairs #6 Light Gray, round, 1/2" dia. at base, 3/8" dia. at top, 1/2" high, 1/8" shaft, white dot on base, one set screw - Available Quantity 3 pairs #8 Dark Gray, round, 1/2" dia. at base, 3/8" dia. at top, 1/2" high, 1/8" shaft, white dot on base, one set screw - Available Quantity 1 pair Note that 1A and 1B are the same except for the hole diameter Note that #6 and #8 are the same except they are the new and old color scheme respectively. Size differences in the collage are not representative. Please use the dimensions listed above. I have a few other unusual knobs similar the ones shown. Contact me if you are interested.