T.K.Excellent Flat Head Concrete Screw Anchor 7.5x90mm 40Pcs and Inner Hexagon Socket T30 Kit (YZ/P)

I had these and tapcon screws and though they both work well I found these to be more of heavy duty fastener. I ended up preferring using these when I wanted a stronger securement and used the tapcon for wall control boards and other similar uses.