MagiDeal Luthiers Double Headed Fret Hammer Tool Sturdy and comfortable hammer to refret fingerboard on stringed instruments (guitars, ukulele, mandolin, bass, etc). Versatile tool for also retiring nuts and bridges. It has a soft and hard rubber ends. Easily replaceable by unscrewing them. Excellent tool for delicate jobs. Hammer measures 10 inches in length; the hammerhead is 2-1/2 inches in width. Diameter of the hammerhead is 1 inch.