These Borefast white Phillips pan head screw anchors are a 3/16 in. x 1-1/2 in. size, sold as a 25-piece pack. The Borefast anchor screw in one is a one-piece anchor for fastening into drywall and masonry materials. Borefast anchors self-drill through drywall and easily penetrate both wood and metal studs. They also fasten into concrete, brick, block and plaster when a 3/16 in. hole is pre-drilled.