The 5 lb box of Rockite Anchoring Cement is a hydraulic cement compound designed for superior strength and bonding. It mixes smoothly with water, sets in just 15 minutes, and does not shrink. Within one hour, it achieves a compression strength of 4,500 lbs per square inch. Rockite securely anchors bolts, posts, screws, hooks, bowls, washers, railings, rods, signs, pulleys, racks, poles, seats, and motors to metal and concrete surfaces.