Profile have been the premiere brand for 3-piece cranks for the last 15 years. These cranks are made in the USA to the highest quality. The arms are made from 4130 chromoly and the spindle is a heat treated Gun Drilled Hollow (GDH) 4130, 48spine spindled and 5 3/4 long.Still the best cranks around and they now come with the flush bolt upgrade and hollow spindle as standard in new colours for 2011. If you unsure on crank arm size; the 'standard' size is 175mm - it's used by 99% of riders. Sizes available are 145mm up to 180mm in 5mm increments, Please enquire if you do not see the size you would like. Sold as arms, spindle, spacers and tool only.Made in USA. 4130 aircraft alloy, 48 spline spindle, heat treated and 100% guaranteed - Profile Racing's superior computer designed 4130 chromoly crank arms reduce stress and eliminate flex. Floating spindle allows precision chain alignment. Save weight and upgrade to a titanium spindle (Separate listing)Includes 2-arms, Chromoly spindle, Spider bolt, Flushbolts, Installation and removal tool, Anti-seize lubricant, Installation manual and warranty card and Aluminum spacers. 934g.