BILTWELL - BILTWELL 6014-2016 slotted Black Keystone XL. For the entire line of Biltwell 1" handlebars, see pages 1139-1140 of the 2019 Drag Specialties FatBook. Category: 1" Handlebars. Manufactured from 1" OD x. 120" wall seamless 4130 chromoly tubing.