The Eclat Metra Stem uses a traditional & solid classic topload design, with the addition of a wider faceplate & larger head bolts really clamping your bars down. 6061-T6 alloy that's cold-forged with a CNC'd finish that's strong & durable with some cut outs helping to keep the weight down. That wider faceplate & STC (Shark Tooth Clamping) work together to lock your bars firmly in place. section Product Specs TYPE: Top Load REACH: 51mm RISE: 30mm CLAMPING DIAMETER: 25.4mm WEIGHT: 367g (12.92oz)