Rubber O-Ring embedded in front lock nut for secure locking. Milled slot body for positive reel retention. All aluminum reel seats are completely assembled except for cap. All A7 reel seats come withend cap. A8 reel seats do not. All Aluminum available in Titanium or Black Satin Anodizing. A8 reel seats use with A8CAP end cap, or fighting butts F2M, F2, or F5 each sold separastely. Vendor: Pacific Bay