The is one of the following nearly identical termination anchors:

Image Item Finish Rope
Bee Access Termination Anchor Bee Access Termination Anchor Anodized 5/8" - 3/4" (16-19 mm.)
Big City Access Hold Me™ Termination Anchor Big City Access Hold Me™ Termination Anchor Anodized 5/8" - 3/4" (16-19 mm.)
Guardian Fall Protection #01300 Guardian Fall Protection #01300 Anodized 5/8" - 3/4" (16-19 mm.)
Mio Mechanical RCP–12, Version A Mio Mechanical RCP–12, Version A Galvanized 7/16" - 1/2" (11-13 mm.)
Mio Mechanical RCP–12, Version B Mio Mechanical RCP–12, Version B Anodized 7/16" - 1/2" (11-13 mm.)
Image Item Finish Rope
MSA RIW1000 MSA RIW1000 None 5/8" (16 mm.)
MSA SRIW1000 MSA SRIW1000 Anodized 5/8" (16 mm.)
Spider Spider Anodized 5/8" (16 mm.)
Tractel Splice-Safe V4260 Tractel Splice-Safe V4260 None 5/8" - 3/4" (16-19 mm.) laid
7/16" - 1/2" (11-13mm.) kernmantle
Westfall Pro WF–7001 Westfall Pro WF–7001 Anodized 7/16" - 3/4" (11-19 mm.)

My first impression was that these were designed for members of the bigger-is-better crowd and for people who don't know how (or can't be trusted) to tie knots. Even so, users should be particularly careful to follow the rigging illustrations exactly, even when it not provided. The typical illustration, if one exists, has an Escheresque feel that makes it easy to overlook some of the subtleties required for proper use. By the way, the rigging illustrations, when they exist, do not always completely agree with each other.

These can be used to create an anchor that can be released under load, but that can be done without requiring special equipment. These might prove useful in some specialized situations (perhaps in training rigging?), but I don't see much need for these in general caving or climbing.