Ivoroid Guitar Strap Button with Black Pearl Dot Polished ivoroid strap button with a 3mm black mother of pearl dot Can be installed in the neck heel of your instrument Includes a white leather washer Installation requires a 1/8" drill bit and a #6 wood screw tap (not included.) Please see our $2 Strap Button Tapping Tool listing. We combine shipping for multiple Iluak items. After your purchase is complete, we will refund part of the shipping fee.