Used for rigging contingency anchors. Couple options which all function much the same:

Apparently, there is a world-wide shortage on these. My supplier carries several brands, and it out of them all.

Cypher Figure 88 -- anodized. Another real nice basic Figure 8 for rigging anchors. 4.0 ounces / 110 grams

and

Kong Bonatti - Polished 8 -- Another real nice basic Figure 8 for rigging anchors. 4.0 ounces / 110 grams