A spiral anchor resembles a fat, very coarse-thread screw. It has a flat Phillips screw head and sharp self-drilling tip. There's also a hollow screw hole through the center of the anchor.

Basic expanding anchors typically have the lowest weight limits and require you to drill a pilot hole first before inserting them into the drywall. Self-drilling anchors provide a bit more ...

Union Depot made Carl Bolander & Sons the first contractor in the U.S. to bore large diameter, hollow core self-drilling anchors (SDA) to depths of 100 feet or more. The 1920s-era depot is being ...

“The self drilling anchor business has an excellent strategic fit with Minova’s Tunneling & Civil business and will get the right environment to grow.” Atlas Copco supplies a wide range of ...

These picks will hold anything from picture frames to heavy shelves Because drywall is not very strong on its own, it can’t support much more than a few pounds on a regular nail or screw without ...