Qty 12 Anchors for Concrete, 1/4-20 Thread for Hurricane Shutter Bolts Anchors & Sidewalk Bolts, Wall Anchor
- Required hole diameter equals anchor diameter.
- variation in hole size can be accommodated by turning the expander nut.
- the bolt is simply re-inserted and torqued to obtain original holding power (the nut stays in the hole).
- Bolt can be removed and re-used with a new nut after cleaning and lubricating the threads.
- strength - the highest shear strength of any expansion anchor.