Steerer clamp: 28.6mm ( 1-1/8in) 

Stack height: 40mm 

Bar Clamp: 31.8mm 
Extensions: 80mm, 90mm, 100mm, 110mm (measured along the side of stem from center of steer clamp to center of h'bar clamp)
Angle: +/-7° or +/-35°
Material: 3-D forged 6061-T6 Aluminum

Weight: 149 grams (80mm)