Metolius Astro Nuts will become the backbone of the micro sized gear on your climbing rack. Designed with a revolutionary shape to give you solid placements in pin scars and subtle flares whether you are aid climbing or going free. Metolius chose silicon-bronze because it exhibits the perfect blend of hardness and shear strength. This, combined with their patented Curve Nut shape (modified with a slight transverse taper), gives you micro gear which is easy to visually monitor and sets up the bomber triangulation necessary for a solid placement. The best materials, combined with the patented Curve Nut shape , give a powerful tool for protecting thin fissures. Astro Nuts will become the backbone of your micro-sized pieces, whether you are just starting out on traditional climbs, or if you're a big wall climber or alpinist.