"HILLMAN" STRIKE ANCHOR 25 Pack, 1/2 x 3-1/2", Strike Anchor, Steel/Yellow Dichromate, Coarse Thread, Thread Length 1-3/16", Embedment Depth 1-3/4", Minimum Hole Depth 2-1/8", Drill Size 1/2", Maximum Thickness To Fasten 1-1/8". Features:- Size: 1/2 x 3-1/2" Drill size: 1/2" Thread length: 1-3/16" Embedment depth: 1-3/