Quick view Powers 3/4" x 2 3/4" Hex Nut Lock BoltĀ® 5050S (Box of 10) Box of 10. 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 sleeves are added to create longer lengths. MSRP: Was: Now: $23.09 Add to Cart