For install 1-1/8” ZS and 1-1/2” ZS headset to avoid damage lightweight headset.
It also can use on bearing preset headset on another side.
‧TB-935B: for 1-1/8” ZS headset.
‧TB-935D: for 1-1/2” ZS headset.
Bearing cup press adaptors TB-935B；TB-935D