a drop - in anchor includes a sleeve having a threaded region having an internal thread formed therein and a split region having at least two longitudinal channels formed therein . the channels define sections . the split region has inwardly tapered inner walls . a plug is configured for engagement with the sleeve at the split region . the plug has a top surface and defines a tapered shape . a bolt having a threaded portion and a through - bore extending longitudinally therethrough , is configured for threaded engagement with the sleeve threaded region . a setting member is configured for insertion into the bolt bore . the setting member engages the plug top surface and a force exerted on the setting member drives the plug into the sleeve split region so as to urge the split region sections axially outwardly . a method for securing the anchor in the opening in the structure is also disclosed .