The Metolius Astro Nut Aid Set utilizes the same revolutionary transverse taper Metolius&'; Curve Nuts for providing greatest contact to the rock. The Astro Nut Aid Set contains #1-#5 stoppers for protecting tight spots and pin scars. Silicon Bronze construction gives them maximum bite, strength, and durability Two excellent placement options, thanks to the double curved design Low-profile cable and swage Color-coded, anodized collars make placements and identification easier Includes comprehensive instructions on use, care and maintenance Made in the USA