Simpson Strong-Tie's 1/4 x 1-1/2 in. CSD/DSD Countersunk-Head Split-Drive Zinc-Plated Anchor is useful for attaching fixtures, trim, brackets, and other components where straightforward mechanical anchoring is required. Installation involves drilling the appropriate hole, positioning the anchor through the fixture, and driving the anchor with a hammer to expand the split-drive section inside the substrate. The countersunk head seats neatly against the mounted material, while the zinc-plated finish provides a suitable level of protection for many interior fastening environments. A 100-pack provides an efficient quantity for contractors and installers handling multiple concrete or masonry anchoring applications.