Abstract: A hybrid drop-in anchor includes an expansion sleeve. A split base region of the anchor body has a setting plug to be driven baseward by setting tool for preliminary setting in a borehole. The sleeve resiliently surrounds an external annular body recess of the body above a tapered base region portion, and has a clip arcuate portion extending at least most of the periphery around the external annular recess. Clip segments extend baseward from the arcuate portion. Each segment has proximal portion having a segment intrinsic radial thickness and includes a distal portion having at least one intrinsic projection, namely a boss, standing radially outwardly from the outer surface of the distal portion. The boss is raised from the outer surface of the distal portion without there being a corresponding cavity of said blank on an inner surface of the distal portion, to provide a projection of thickened total depth greater than the segment intrinsic radial thickness.