Keyhole rivet hangers are designed for use on rivets or hangerless bolts and are stronger and more durable than traditional cable rivet hangers. The beefy 0.090"-thick stainless steel hangers inspire confidence and make it possible to utilize the full strength of a rivet or bolt. Compared to cable rivet hangers, keyhole hangers are shorter in height, enabling a climber to gain maximum reach from a rivet or bolt. Both the 3/8" and 5/16" hangers are designed for added security such that once clipped with a carabiner, the hangers cannot come off of a rivet or bolt until the carabiner is unclipped from the hanger. Moses keyhole hangers are tumbled to create a smooth finish that feels good in the hand and they fit a wide variety of anchors, including 1/4", 5/16", and 3/8" round or hex-head rivets and bolts. For backcountry use, a few keyhole hangers can provide lightweight insurance for use on the unexpected hangerless bolt, should the need arise. Designed for use, and tested on Yosemite&';s big walls. SPECIFICATION: 3/8" Keyhole Rivet Hanger Stainless steel Thickness = 0.090" Laser-cut shape Weight = 22 g / 0.77 oz. 5/16" Keyhole Rivet Hanger Stainless steel Thickness = 0.090" Laser-cut shape Weight = 15 g / 0.53 oz.