The Giant Contact OD2 stem is a 3D forged 6061 aluminum construction oversized box section stem, featuring +/-8° flip flop adjustable rise requiring fewer spacers.FEATURES3D forged 6061 aluminum alloy body with oversize box cross-sectionOversized 46mm wide 6061 alloy faceplate±8°rise requires fewer spacersFor 1'1/4" (Overdrive2) steerers1'1/8" (Overdrive) adapter includedFor 31.8 diameter handlebarsSteel hardware