The Kong anchor connector is made of high quality stainless steel AISI 316.

Kong Stainless steel swivel anchor connector features:

The swivel anchor connector is great for reducing chain twist when trying to bring an anchor to the surface
Allows the anchor to swivel independently and the connector to ride smoothly over the bow roller
Designed to go over bow rollers and pass through hawse pipes without snagging
Sleek, slim, snag-free profile

Kong Stainless steel fixed anchor connector features:

Slim profile
Non-swivelling
Snag-free passage over bow rollers and through hawsepipes

Type	Kong Chain Size	Jaw Width on Anchor End	Kong Break Load Straight	Kong Safe Working Load Lateral	Compatibility
6 - 8 mm Swivel	6-8mm	16mm	2500kg	850kg	6mm,7mm
6 - 8 mm Fixed	6-8mm	-	2500kg	850kg	6mm, 7mm
8-12 mm Swivel	8-12mm		5000kg	2000kg	8mm, 10mm
8-12 mm Fixed	8-12mm	-	5000kg	2000kg	8mm, 10mm

Kong Chain Size = the chain sizes that fit on the chain end, not the anchor end
MBL = Manufacturer (Kong) straight Break Load
MWL = Manufacturer (Kong) lateral Safe Working Load
Compatibility = reasonable compatibility with Grade 40 chain break load

6-8 mm