Check the listing for details. Guitar String Mounting Ferrules Through Body Mounts String Caps for ST TL Black. Color: Black, Condition: New. Listed at 8.99 USD. Oletone Guitar String Mounting Ferrules Through Body Mounts String Caps for Tele Strat Style Electric Guitar Bass Parts Replacement Set of 6Pcs Black Product Description 1, Fits into the back of the body and locates holds the strings, very nice black finishing look. 2, Perfect for that string through body build or repair. Ideal for new build bodies or fits into existing recesses, but please verify the size needed for your body before purchasing. 3, These guitar mounting ferrules can increase the pressure of the strings on the bridge, make the strings vibrate more effectively, improve the resonance and increase the delay, make the sound stronger. 4, 11mm overall length mounting into a 6.5mm diamter hole in the guitar body with an 8mm diameter collar. The main body is machined with a cross hatched design to help hold a tight fit into the mounting hole. The interior hole tapers from 5.2mm to hold the ball end of the string down to 3.2mm at the tip to assist in easy string mounting - no more frustrating jabbing around trying to get the damn string through the mount hole. 5, Easy to install and convenient to use. Metal material, Great replacement for your old, broken ferrules. Package includes: 6pcs string mounting ferrules. Specification Small hole diameter: approx.3.2mm; Big hole diameter: approx.5.2mm(inner) 8mm(outer); Total length: approx.11mm; Insertion part into body diameter: approx.6.5mm; Note They are indeed fit for most guitar bodies. However you need to verify the correct size you needed before purchasing. Great for your replacement or DIY project. Item's color might be different from the picture because of the aberration.