5/16" by 3" wedge bolt. Removed from "Face Lift" at San Ysidro. Best case, this bolt had just 2,300 lbs of strength in medium-hardness (2,000 psi) rock--and even less in our soft central coast sandstone. These bolts are the dominant type at SY and are prevalent elsewhere in Santa Barbara. Unfortunately, they are visually indistinguishable from the 3/8" variety.