The Giant Contact OD2 stem is a D forged 6061 aluminum construction oversized box section stem featuring +/-8° flip flop adjustable rise requiring fewer spacers. Features 3D forged 6061 aluminum alloy body with oversize box cross-section Oversized 46mm wide 6061 alloy faceplate ±8°rise requires fewer spacers 1-1/8” steerer adapter included For 31.8 diameter handlebars Steel hardware Specifications Fits Giant OD2 1 1/4 steerer tubes Fits Giant OD2 1 1/4 steerer tubes