NOTE Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. This is string tree retainer used on bass guitar to pull the strings down to give them the correct pitch. Metallor Bass Guitar String Trees String Retainer Guides for Bass Guitar Parts Replacement Pack of 2pcs with Mounting Screws. (Black). Imported from USA... PRODUCT DESCRIPTION This set of 2 guitar string tree guide retainer can retain the string perfectly and reduce string friction to save string, and guarantee more accurate tuning. Retain the string perfectly and reduce the string friction to save string, and guarantee more accurate. Top Diameter: 19mm/0.75inch, Height: 10mm/0.39inch, Shaft Diameter: 6.3mm/0.25inch, for specific dimensions, please look at the size diagram. DISENS Round Electric Bass String Retainer Guides Metal Bass Parts MAXCHEER Roller Guitar String Trees Guides Retainer For Fender Strat Stratocaster Tele Telecaster Electric Guitarpack Of 4 Chrome Bass Strings Made of durable metal material, ready for use. NRS 1 HD Tie-Down Straps - Utah Whitewater Gear The measurement allowed error is +/- 1-3cm.)