Daiwa Exist Iggist 2506 Spinning Fishing Reel Used From Japan BNB

What is this (circled) part on a spinning reel? What is it for? 40 years of fishing and I've never used it for anything : r/Fishing

Daiwa PRIMAX 2500 Spinning Reel Fishing USED

Daiwa Saltist MQ 6000 Spinning Fishing Reel - New Used 2x Shimano

Daiwa RS 4000 Spinning Reel with 9 KGS Max Drag at Rs 1800/piece

Daiwa SALTIST5000 Saltist Spinning Reel - TackleDirect

Daiwa CERTATE 2500 R-Custom Spinning Reel B8425 USED – North-One

Volkmi Navion Tw Seawater-Proof Screw-In Pan-Used Shallow Line Cup Fishing Reel Sea Pole Metal Spinning Wheel Tw5000 Pan-Purpose Cup Other

Daiwa EXIST STEEZ 2506 Spinning Reel used

Daiwa Spinning Reel / Silvercast 80 / Very clean

DAIWA reel spinning reel LEGALIS2506 USED