The SB anchor bolt is a high-capacity solution for holdowns that require larger diameter anchors. The smooth transition angle positions the head of the anchor in the optimum location in the concrete stem wall to maximize performance. The SB1x30 covers holdowns utilizing a 1″ diameter anchor that exceed the capacity of our SSTB bolts. SB 1 in. Dia. x 30 in. Anchor Bolt (Pack of 4).