"Loops" or "eyes" in the plural, of course.

"Gaza" means a loop in the cable, also known as an "eye".
A "casquillo" is a sleeve or swage which fits over the splice forming the loop and protects it. A loop of this kind is most commonly called "swaged".

"Eslinga plana en cable de acero.
La presente invención disminuye cuantitativamente la mano de obra en este tipo de eslingas, gracias a la utilización de un casquillo convencional de aluminio (1) para prensarlo mecanicamente en las gazas u ojos (3) y así poder formar una eslinga segura con todo tipo de garantías."
See illustration
http://www.oepm.es/pdf/ES/0000/000/01/05/55/ES-1055517_U.pdf

http://www.tenso.es/productos/codigos.asp?subfamilia=Eslinga...

"Wire Rope Slings
Single Part, Mechanical Splice
The eye or loop end preparation is formed using the Flemish Eye Splice.
Sleeve construction depends on application:
Aluminum - Steel - Stainless Steel [...]
Single Part, Hand Splice
The eye or loop end preparation is formed using the Tapered Eye Hand Splice. No metal sleeve required to secure the eye."
http://www.americanriggers.com/ropeslings.html

Fuller details of sling types here:
http://americanriggers.thomasnet.com/Asset/Catalog.pdf

"Types of Wire Rope Sling Terminations
Flemish Eye Splice
The most popular splicing method. It's safety relies mainly on the craftsmanship of the correct splicing method. The sleeve's function is to secure the strand ends around the rope body.Standard 6-strand UNI-LOC® swaged Flemish Eye Sling
UNI-LOC® swaged TRI-Flex® Flemish Eye 3-part Sling"
http://www.prothermindia.com/guidelines.pdf

"TIE DOWN ENGINEERING" CABLE SLING
Professionally swaged loop on each end for locking valuable equipment"
https://store.mdsupply.com/products/cable-sling-6--1-4-3-8-v...|5391859.html