Kratos makes lots of height safety equipment, with this steel snap hook being a popular product from the range of items we stock here at Lifting Gear Direct. It can be coupled quickly to a harness or anchor point, then remain reliably attached until the user chooses to release it.
Because it is made of steel, you can be certain that this snap hook is strong enough to withstand rigorous use, as attested to by its 23kN breaking strength.
The gate opening of this snap hook is 18 millimetres across, which should be enough to accommodate D rings on harnesses as well as safety lanyards and other components.
You can never be too careful when working at height, so a snap hook like this should be just one of the products you invest in before carrying out this type of operation.