Quick view Powers 3/8" x 2 3/4" Combo Flat Head Lok-BoltĀ® 5340S (Box of 50) Box of 50. The Lok-Bolt anchor is a pre-assembled single unit sleeve anchor available in carbon steel and stainless steel which can be used in concrete, block, brick and stone. Extension... MSRP: Was: Now: $47.20 Add to Cart