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Four BLUE color anodized potentiometer knobs for use with amplifiers, preamps, electric guitars, radios and other devices that have 6.0 mm diameter potentiometer shafts. The knobs have a knurled finish around their circumference. The knobs do not have a plastic insert; they are CNC machined from one piece of solid aluminum and have a durable red-color anodized surface finish. Dimensions: 25 mm diameter, 15.5 mm height, 6.0 mm shaft hole diameter. *****PLEASE NOTE: These knobs will only fit European/Asian manufactured potentiometers with a nominal 6.0 mm shaft diameter. ***** The shaft hole depth is 14 mm (this depth includes the 10.5 mm drilled depth and a 3.5 mm machined recess on the backside of knob - see photos). NOTE...Sorry but these knobs WILL NOT FIT ¼ inch (6.35 mm) diameter potentiometer shafts.***** Please...Accurately measure the potentiometer shaft diameter and length with calipers or a micrometer before placing an order. These knobs will not fit 1/4 inch shafts - that small 0.35 mm difference in diameter between European/Asian and most US manufactured potentiometer shafts is very unforgiving when it comes to metal knobs! Each knob is secured to the shaft with a single setscrew (setscrews and a 2 mm hex wrench are included with the knobs). If you only require two knobs or identical color knobs for a different shaft diameter please click on our storefront "Riverstone Audio" at the top of this page to view more products.