Nukeproof horizon direct mount stemthe horizon dm stem is based on the nukeproof sam hill direct mount stem, which was developed in conjunction with the 5 time downhill world champion. It shares the same stiffness and strength, but in a slightly longer 45mm length. It also features extensive cnc machining to the 6061 aluminium, ensuring outstanding stiffness and a very low weight. A perfect match to the nukeproof horizon bars, the horizon dm stem is finished off with huge m6 bolts throughout for extra security, making this the perfect option for the most aggressive downhill riders.features material 6061 aluminium extensively cnc machined to reduce weight oversized m6 bolts throughout bar clamp diameter 31.8mm rise 30 degrees use downhill weight 145gdirect mount stem instructions available to download here .pdfbuy nukeproof components from chain reaction cycles, the world's largest online bike store.