The Powers Fasteners,1/2-13 X 2 Cap Screw Zinc Grade 5 anchors have a variety of applications including: concrete and concrete block, masonry, brick, and clay. Corrosion resistance is guaranteed due to Powers' salt spray testing, kesternich tests, pressure treated lumber tests, and chemical/electro-chemical testing. Both coatings/platings and corrosion resistant materials are available. Powers does not simply stop at corrosion resistance testing however; multiple strength tests of their products are performed to make sure that their anchors will not fail under high load and stressful applications. The types of strength tests include: tension testing, shear testing, combined load testing, bending load, dynamic/shock load tests, pre-load tests, and torque tests.