The 4-in-1 Hole Saw Set includes Sds Plus connecting rods, 4.4-inch pilot drill bits, a hex bolt, and 3 different sized hole saws for versatile and precise drilling. Made of durable tungsten steel and cemented carbide, this set efficiently drills through tough materials like concrete, brick, and stone. With ventilation holes to improve drilling efficiency, the set is perfect for tasks such as installing pipes and tubing. It fits Sds Plus hammer drills and includes an accurate pilot drill bit for precise hole placement. Backed by reliable Xdovet customer service, the set ensures satisfaction.