Titanium Spindle upgrade or replacement for Profile Race cranks & No Boss Cranks. Made in the USA at profile's factory in Florida. This spindle is machined from aircraft grade titanium & is a must if you are looking to lighten you ride. Fits profile race cranks & other 48spline 19mm cranks. Comes with Crmo Flush bolts & washers. Gun Drilled Hollow. section Product Specs Rise: 19mm Bar Clamping Diameter: Titanium Bar Clamping Diameter: 158g / 5.53oz