These detachable plates allow the stem to clamp the fork tighter than stems with build in tabs. They also save you some money on a new stem if you want to ditch the "spinny thing" without buying a new stem.
606 T 6 material
FITS USA MADE S&M/FIT STEMS. DOES NOT FIT made in Taiwan FIT HIGH TOP V.2
606 T 6 material
FITS USA MADE S&M/FIT STEMS. DOES NOT FIT made in Taiwan FIT HIGH TOP V.2