Electric guitar tremolo arm are compatible with stratocaster electric guitar tremolo system. Easy to install.A good replacement part for broken or old one. Electric guitar tremolo arm is helps you to easily adjust the tension of string and change the tone to get better tremolo effects. Ideal instrument guitar parts replacement for guitar lovers and players. Product Specification: 100% Brand New Material: Metal Color: Gold Black hat ,Gold White hat (Optional) Size: Insert diameter is about 6 mm/ 0.24 inch The length is approx. 16.6 cm/ 6.53 inch Weight: 74g Package Content: 4 x Roller Guitar String Tree Guides Retainer Note: 1.If you are not satisfied with our product you received, you can send emails to us at any time. We will reply you instantly and help you solve your problem. 2.Due to different monitors, there may be a little color difference. 3.before purchasing, please check the threaded hole of the vibrato arm of you guitar is 6 mm.