Features: * brand new and high quality. *Chrome Barrel Knobs for Electric Guitar/Bass Domed Knurled Volume Tone Knob Volume and tone knobs are heavy duty! *We use a standard shaft opening that is universal for any 6mm coarse splined, fine splined or solid pot shaft. *Simple and Easy to Install. Instructions: Back out Set Screw Slightly to Allow Easy Placement. Slide Knob on Shaft to Desired Height. Align Set Screw with Shaft Split. (Splined Shaft Only.) Failure to properly align can result in knobs coming loose, falling off, and being lost. Tighten the Set Screw. Do not over tighten to avoid stripped threads or damage to knob/shaft. Specifications: Type: Knobs Color: Chrome,Black,Gold(As shown) Position: Volume Tone Push on 6 mm pots Package list: Knobs*4 Wrench * 1