"HILLMAN" LAG SHIELD 100 Pack, 5/16 Long, Lag Shield, Drill Size 1/2", Minimum Embedment 1-3/4". Features:- Size: 5/16" Drill Size: 1/2" Min. Embedment: 1-3/4" Base Material: Brick, concrete, hollow block Holds Up to (4000 psi Concrete): 200 lbs 100 per pack.