The Delta stem is the first, modern, 31.8mm oversize stem designed specifically for BMX racing. When used with the Box Triple Taper Alloy or Box One Chromoly (aka Maximus) handlebars, you get the absolute stiffest cockpit available. This added stiffness significantly improves bike handling while putting more upper body power into your pedal stroke, translating into more forward momentum. The Delta stem body is extruded & CNC-machined from the highest quality 6061-T6 aluminum. The top clamps are cold forged & CNC-machined for increased stiffness & strength. Despite their size & girth, Delta stems weigh less than many standard size 22.2 stems. section Product Specs TYPE: Top Load REACH: 48mm/53mm/60mm RISE: 0 CLAMPING DIAMETER: 31.8mm WEIGHT: 299 grams / 10.5 ounces (53mm) E3