吊环

Blade tools: eyebolt, turning tool, Allen key, screw tap, milling cutter, drill bits, etc.

埃令螺丝（吊环）、圆车、六角匙、丝攻、铣、钻咀等。

Guess that the long Dao dressed by generals in early time had flying ring,and the modern noble's long Dao was hung on caestus directly,so there's no flying ring.

推测早期藩将所配长皆有吊环，近代贵族长直接别在腰带中，故无吊环。