Forward Controls Design HK Hook and Uloop 4140 End Plate w/Eyelet Black. Machined from a solid piece of 4140 steel and DLC coated it's an option for users that don't want or need the quick detach function. ESF-E can be used with a piece of paracord Forward Controls Design recommends Blue Force Gear's ULoop or the ubiquitous HK hooks. The width of the eyelet is wider than the eyelet on HK rifles and submachine guns to ensure durability. Specifications for Forward Controls Design HK Hook and Uloop 4140 End Plate w/Eyelet: Manufacturer: Forward Controls Design Color: Black Finish: DLC Fabric/Material: 4140 Steel Package Contents: Forward Controls Design HK Hook and Uloop 4140 End Plate w/Eyelet Forward Controls Design ESF-E: HK Hook and Uloop 4140 End Plate w/Eyelet Black