Sharkie Anchors assist with safely holding things in place. This anchor features anti-rotation fins and a unique head to prevent sinking and spinning. Sharkie anchors work in almost any building material. Kit contains: 1/4" Sharkie (25), #10 x 1-1/2" screws (25), 5/16" Sharkie (20), #12 x 2" screws (20), 1/4" and 5/16" Drill Bits, and one (1) #2 Phillips Bit.