Drop-in anchors are internally-threaded

They are actually stronger than most metal and chemical anchors because the all plastic plug bonds through friction to concrete

7/64 Cobalt Heavy Duty Jobber Drill Bit

3/4-10 x 10 A307 Grade A Carriage Bolt HDG

Made of heat-treated carbon steel and available in both zinc plated and mechanically galvanized finishes

1/4 x 1 1/4 Round Split Drive Anchor Zinc Plated (100) 5/8-11 Socket Cap Screws 316 Stainless Steel Drop-in anchors are internally-threaded1 4 x 1 1 4 Round Split Drive Anchor Zinc Plated (100) . The Drive anchor is a one piece, tamper proof, pre expanded anchor available in carbon steel for use in concrete and stone.