SLIP-THRU THIMBLES are designed to allow passage of an identical thimble through its eye. This is a necessity when a regular sling is used as a choker sling. SLIP - THRU THIMBLES also prevent the eye of the sling from mashing together and the top of the eye wearing excessively. The generous inside Dimensions allow the thimbles to fit large crane hooks. Rope retention ears are tapered so they can be bent or peened over wire rope.