Do you want a higher handlebar to sit more upright? You can do this by extending your stem with this adapter. Fist with the WATT MONTREAL and WATT BROOKLYN. 

Specifications

Color: silver
Material: aluminum
Weight: 223 grams
Stem length: 117 mm
Stem diameter: 28.57 mm (1 1 / 8``)
Clamp diameter: 28.57 mm (1 1 / 8``)
Clamp height: 50 mm
Adjustable: yes

Content:
1 Adapter
1 Washer (10 mm thick)
2 shims (thickness 5 mm)
1 Washer (8 mm thick)