锁铃器 Socket tool

培铃仅需一支即可，一次锁紧一边，再锁另一边。

For bearing diabolo, you'll only need 1pc socket tool to tighten, one side at a time.

定轴只有EVO实色/MHD-pro 会用上2支，两边同时转紧。

For fixed diabolo, like EVO G1/MHD-pro which has two screw nuts, you'll need 2 pcs to tighten both sides together.