The Metolius Astro Nut features the same revolutionary concept as Curve Nuts in micro sizing. Made of silicon bronze for maximum bite and strength, they are awesome in flares and pin scars. Astro Nuts have color-coded, anodized collars that make identification easy. size range strength weight 1Gray 0.12 - 0.24"3.1 - 6.1 mm 315 lbf1.4 kN 0.20 oz.5.7 g 2Blue 0.14 - 0.24"3.5 - 6.1 mm 315 lbf1.4 kN 0.21 oz.6.0 g 3Gold 0.16 - 0.24"4.1 - 6.1 mm 550 lbf2.5 kN 0.22 oz.6.2 g 4Red 0.18 - 0.26"4.6 - 6.5 mm 550 lbf2.5 kN 0.23 oz.6.5 g 5Black 0.21 - 0.29"5.3 - 7.4 mm 550 lbf2.5 kN 0.25 oz.7.0 g 6Gray 0.24 - 0.32"5.9 - 8.1 mm 1350 lbf6 kN 0.39 oz.11.0 g 7Blue 0.27 - 0.37"6.9 - 9.4 mm 1350 lbf6 kN 0.49 oz.13.9 g 8Gold 0.32 - 0.42"8.1 - 10.6 mm 1350 lbf6 kN 0.56 oz.16.2 g 9Red 0.37 - 0.49"9.4 - 12.4 mm 1800 lbf8 kN 0.77 oz.21.8 g 10Black 0.42 - 0.55"10.6 - 13.9 mm 1800 lbf8 kN 0.95 oz.26.9 g * Dimensions are depth and width at the top (widest part) of the nut.
