This is a tremolo arm for Stratocaster-type guitars. Arm diameter: Approximately 5.0mm Threaded section: Approximately 4.5mm The color is as shown in the first photo. Other colors are here > #QONNYGuitarMaintenance ========================================= Get a great deal when you buy together with guitar picks and other items. ■Guitar Accessories >> #QONNYGuitarMaintenance ■Guitar Supplies List >> #QONNYGuitar ■Musical Instruments List >> #QONNYInstruments