MKT Fastening steel conset masonry screw anchor. Commonly known as "Tapcon". Made of high strength steel for use in all types of solid and hollow masonry, wood and stone. Fluorocarbon coating offers high resistance to corrosion; costing withstands 1000 hour salt spray test. Cuts its own threads. Fast, easy installation; drill bit included in each box. Softer base materials require undersized bits for best results.