The forged aluminum bracket offers solid, easy to use construction alongside an industry leading fit range. It is also compatible with our riser kits. The bracket is designed for 31.8mm bars and 22.2mm extensions in aluminum or carbon. SPECS: Materials: Forged 6061-T6 AL Stack Height: 42.6mm Width Adjustment: 37mm Basebar Clamp Diameter: 31.8mm Extension Clamp Diameter: 22.2mm Color: Black Weight: 234g