Heat Treated 4130 Chromoly Tubular Crankarms that are square ovalized for crankarm grinds and strength, with a 4130 Chromoly 19mm Spindle to match. Available in E.D. Black only. 170mm or 175mm. BB Not Included. Cranks feature no bosses and are suitable to work with Spline Drive sprockets only, these are LHD/RHD compatible.