"HILLMAN" STRIKE ANCHOR 50 Pack, 3/8 x 3-1/2", Strike Anchor, Steel/Yellow Dichromate, Coarse Thread, Thread Length 1-3/16", Embedment Depth 1 9/16", Minimum Hole Depth 1-7/8", Drill Size 3/8", Maximum Thickness To Fasten 1-3/8". Features:- Size: 3/8 x 3-1/2" Drill size: 3/8" Thread length: 1-3/16" Embedment depth: 1-9