BSD Leveled Stem – Top Loader Bicycle Neck with new OS 1" technology. Available in 22.2” Regular Version. The 25.4mm diameter hole provides 14% more clamping force on the handlebar and keeps the handlebar in place 30% longer compared to other BMX stems. This BSD technology is compatible only with OS 1” BSD handlebars or Eclat handlebars that feature the same technology. The stem is made from full 6061-T6 CNC with laser cut and includes a fork cap slot.