Product Description The Inner hollow shaft diameter is Approx. 6mm (0.24") in diameter. Dimensions (W x H): Approx. 20 x 20 mm (0.78 x 0.78 inch). These set screw knobs can fit any guitars or basses which have Split Shaft Pots with diameter 6mm or less than 6mm; Please be sure to verify the dimensions carefully before you order the item! Compatible with most Fender Tele, Gibson Les Paul, Strat style electric guitar or precision bass instruments. Durable and long-lasting use.  Metal Guitar/Bass Push-on Abalone Top Control Volume Tone Dome Knobs. Abalone top - this is a natural material so knob to knob might have variations.  The Control Knobs are made of high-quality materials.  There are 16 grooved thick (18 tooth splined) shafts on the potentiometer. The threads inside are plastic and the outside is metal. Real abalone Top are an eye-catching and will dress up your instruments well. Full metal made, quality hand feeling.  They are wear-resistant, durable and not easy to damage. They are the long-term partner of the guitar. It is suitable for most electric guitars and provides convenience for music lovers. Let instrument lovers enjoy DIY. Color:Black/Silver/Red Copper are available. SIZE: The external dimension of the knob is Approx. 20 x 20 mm (0.78 x 0.78 inch)., inner diameter is 0.6mm (1 / 4 ").  Please take care of the size you need before buying. Package List: 1/2/3/4 Pcs Guitar Knob(s) As each monitor is different. There will be some color difference between the product picture and the actual one.