25 LB, Carton Rockite Anchoring Cement, & Hydraulic Type Cement Compound That Is Specially Formulated To Give It Unexcelled Strength & Bonding Qualities, Mix With Water, Pours Smoothly, Sets in 15 Minutes, Does Not Shrink, Within 1 Hour Develops Compression Strength of 4500 LBS Per SQIN, Grips Metal & Concrete Permanently, Anchors Bolts, Posts, Screws, Checks, Hooks, Bowls, Washers, Railings, Rods, Signs, Pulleys, Racks, Poles, Seats & Motors.