This 6061-T6 CNC’d stem comes with 6 Titanium, Tapered head allen bolts to greatly reduce the overall weight and has a low stack height of just 33mm. The Overbite Stem is a high-end BMX product that you’d expect from Elevn, a pure BMX race company, with an ultra low weight that is less that many traditional 22.2 BMX stems. The 31.8 Overbite stem has options for everyone using a 31.8 bar, giving you a stiffer & lighter front end, with the best oversized stem designed for BMX Racing! Material : 6061 T-6 AlloyBolt Material : Titanium Steer tube size : 1-1/8”Clamp size : 31.8mmRise : 29.93mmStack Height : 33mmLengths : 45mm, 50mm, 53mm, 57mm, 60mmBolts size : M8 x 1.25 x 25mmMax torque : 13 N.m Weights :45mm : 229 g / 8.1 oz50mm : 249 g / 8.7 oz53mm : 259 g / 9.1 oz57mm : 269 g / 9.4 oz60mm : 277 g / 9.7 oz