This silver colored Rectangular Bolo Slide fits almost any cord size from 3mm to 5mm. Made of base metal and silver plated, these easy to use Bolo Slides have a square hole just off center that can accommodate rivets or other post types for securing Conchos . You can also glue on your favorite bauble, coin or gemstone with glue or epoxy. Our recommended adhesive is E6000. A bolo tie (sometimes bola tie or shoestring necktie) is a type of necktie consisting of a piece of cord or braided leather with decorative metal tips – secured with al clasp or slide.