What Are Lock On Bmx Grips?

Answer 1

Most grips are just rubber sleeves that are slid onto the bars. While this is fine for most riders, some have issues with grips sliding or twisting.

For those riders there are lock-on grips which come together with two metal collars for each grip. The collars go around the grip and squeezes it against the bar, hopefully keeping it in place no matter what the rider decides to do.