Double auto locking asymmetric hooks. Very strong and adjustable for size.  Used this for offshore work in heavy weather.  Very clean looks pretty well unused.  Weighs approx 1.2 kg packs up pretty small. See my other listing for a second lighter weight and lower spec harness.  Both really excellent condition.  Of the two for sale this is the better one with the safety line alone worth something like three times the starting price new.  Good luck with bidding