Ritchey WCS 4-Axis Stems feature a contoured faceplate with four closely-spaced bolts, distributing flex and stress across a large clamping area, that provides security while reducing risk of damaging lightweight carbon handlebars 3-D Net forged from 2014 alloy for a superb strength-to-weight ratio 40mm Height 40mm stack height Specially designed forged and contoured 4-bolt faceplate for use with today's lightweight, oversized carbon and alloy bars