Cold forged & fully CNC-machined from a number of high strength aluminum alloys, The Box One Stem Lock offers peace of mind & a level of added protection against losing your front wheel & fork legs in the event of a broken steerer tube. The stem lock runs through the centre of your steer tube providing compression for your headset & steering system. These are praticulary good for Carbon forks that use a carbon steerer tube & cannot accept a top cap or star nut. The Box One Stem Locks are backwards compatible with existing Box forks & may work with forks from other manufacturers.