Features: *Brand new and high quality. *Use for electric guitar volume / tone control. *Used to replace the dirty dingy and old knob *The bottom of the knob: about 26mm in diameter *Height: about 12.5mm high . *The central hole is about 5.5mm in diameter . Specifications: Product Name:Guitar Speed Control Knob Material:plastic Color:Black Transparent color Size:approx.26*12MM Weight: approx.4.6g Quantity:1 PCS Package include: 1 x Guitar Speed Control Knob (As Picture Show) Note: Please be sure to verify the size before you order the item. Please refer to the measurement. Tiny measuring error is allowable in normal range. There might be a little color difference due to the monitor camera or other factors please refer to the physical item.