1/4x1-3/4 fh phl tapper. RAWL brand. Concrete screw anchors. Flat Phillips. 100-pieces per pack. Carbide bit included. Thread Diameter: 1/4", Length: 1-3/4", Drive Type: Phillips, Head Type: Flat, Pkg Qty: 100 No. 375309: Thread Diameter: 1/4", Length: 2-1/4", Drive Type: Phillips, Head Type: Flat, Pkg Qty: 100 No. 375310: Thread Diameter: 1/4", Length: 2-3/4", Drive Type: Phillips, Head Type: Flat, Pkg Qty: 100 No. 375311: Thread Diameter: 1/4", Length: 3-1/4", Drive Type: Phillips, Head Type: Flat, Pkg Qty: 100 No. 375312: Thread Diameter: 1/4", Length: 3-3/4", Drive Type: Phillips, Head Type: Flat, Pkg Qty: 100