TC Bros 1 Classic Risers For Harley The TC Bros Classic Risers, designed with a 1 diameter opening, accommodate a wide range of bars. Crafted through investment casting and precision CNC machining from 316 stainless steel, these risers promise durability and an appealing appearance on almost any motorcycle. Features: Investment cast and CNC machined from 316 stainless steel Minimalist design is slim and classic Black is powder coated while Stainless is hand polished 5/16 18 t.p.i. stainless socket head hardware provides secure clamping power Internally threaded on underside to accept 1/2 13 t.p.i. riser bolts (not included) Subtle branding on underside of riser is hidden once installed