titanium chainring bolt nut size: m8*3.5/m8*4.5 Wisdom Titanium was founded in 2013 and is located in China titanium valley—Baoji, focused on the research as well as the development of titanium alloy bolts, nuts and accessories for racing industry, aviation, medical etc. Main products Titanium racing bolts, nuts, studs for car, motorcycle, bicycle are our main products. Besides, we also supply related titanium special shaped parts solution, and experienced in developing new products and references from your samples or idea. Wisdom titanium produce all kinds of titanium bolt nuts for montain bike, road bike, bmx etc. Welcome inquiry: sales@wisdomtitanium.com