【Miwayer Guitar Bridge Pins Size】Length:28mm/1.1inch;Diameter of the head:7.8mm/0.31";Skirt /collar : 5.35mm/0.2";End of post: 4.3mm/0.17"; Length of post: 21mm/0.85". If the pins are too big, simply sand them down until they fit 【Material】It is cut from a complete beef bone, and the material is not easy to break and is tougher. Bone pins can effectively improve the tone of the guitar. By improving the resonance of the guitar box, it can prolong the transmission of the tone of each frequency. 【Easy to Install】For acoustic guitar, Perfect cutting design, simple installation, Designed for 6 & 12 String acoustic guitar 【Improve Better Tone】Great Guitar Replacement Parts，Great accessory for guitar enthusiasts, ideal replacement for your 6 & 12 strings acoustic guitar, making them a great gift for any guitar player 【Miweyer Brand】 Miwayer is committed to the research and production of musical instrument related products. It is a professional musical instrument manufacturer. If you have any questions, you can contact us in time.