"HILLMAN" LAG SHIELD 100 Pack, 1/4 Long, Lag Shield, Drill Size 1/2", Minimum Embedment 1-1/2". Features:- Size: 1/4" Drill Size: 1/2" Min. Embedment: 1-1/2" Base Material: Brick, concrete, hollow block Holds Up to (4000 psi Concrete): 160 lbs 100 per pack.