Perfect if your handlebars are a little on the low side or you simply want a little more adjustment on your bike. The heads-up stem extender extends the height of your handle bars up to 3" without the need to change your stem. Simply remove your existing stem, refit the stem on the heads-up and install it, the heads up utilized your current star fangled nut.... This unit uses the 35mm of space normally occupied by your current stem.