Self tapping bolt designed for use in multiple substrates including masonry, concrete, brick, block, stone and wood These bolts have a 1000 hours Salt Spray Tested (SST) organic silver coating for longevity and peace of mind High-low thread for minimal material displacement and for a stronger grip Non-expansion fixings - so can be used close to the edge with low risk of damage to the base material V-groove cut thread helps to clear the hole in the fixture