The DAVIES plastic pointer knobs could be widely used to DIY effects pedal projects and other musical instrements.All kinds of colors are available.   The following are Davies 1900H Clone Guitar Control Knob with Scalloped Edge, which is with 6.35mm ,18 teeth shaft hole diameter , with set screw, brass insert and with scalloped edge.         These pedal volume knobs is great for the DIY pedal builder that is just getting started in building pedals.   Are you in trouble with looking for the plastic knobs supplier? Are you starting with building your pedals? Then,just come to Liantronic, we will provide you with "Germany Quality", "China Price", "USA Service" ! :)