Specification: Material: Aluminium Alloy;  Color: Black, Red, Silver;  Base Diameter: 28.6mm;  Fork stem diameter: 28.6mm (standard);  Total height: 120mm;  Adjustable height: 0mm - 70mm;    Feature: Tube body made of aluminum 6061.  T4 + T6 heat treatment, 4.9 ultrahigh strength.  Handling more flexible, light weight, easier to force when climbing, operation is comfortable.  The cap has built in screw to steady stem.  Suitable for customer that feel the handlebar is too low.  Suitable for mountain bicycle to rise up the handlebar fork stem.  Easy installation, just connect up the original front fork stem.  The product equip with 4 gaskets,1 x 10mm and 3 x 5mm, can increase the height up to 70mm.  Can freely adjust the gasket to fit your own height.    How to install: 1. Insert STEM-UP onto the fork stem and place height adjusters onto STEM-UP until your preferred height level for your stem.  2. Stem and wheel in the same direction and highten clamping bolts of the stem.    Package Includes: 1 x Bicycle Fork Stem Riser;