If Peter North climbed, he'd use these exclusively. 316 stainless steel (marine grade). Rated to 20kN.
Length= quicklink + chain (not counting the carabiner)
Add $20 for (10) 3/8" 316 bolt hangers: http://renobclimbing.ecrater.com/product.php?pid=1756139
Would you rather have 10 in 8"?: http://renobclimbing.ecrater.com/product.php?pid=1774043