The Volcano FL stem feature an overall wider clamping area, anti-slip grooves along with wider bolt heads, all to help increase holding power & keep your bars exactly where you want them. They also feature some very clean machining, not only to save weight but also give them a personal look. section Product Specs TYPE: Front Load REACH: 50mm RISE: 7mm CLAMPING DIAMETER: 22.2mm WEIGHT: 338g / 11.9oz