DURA CRIB® Prime Cribbing Blocks is an active cribbing products used when a person is working on or near a structure or work piece being stabilised. The pyramid profile on two surfaces provides a secure base and top that interlock at any angle. Three side notches interlock for secure stacking performance. Positive interlocking by gravity and friction prove premium stability and load bearing capacity. Excellent for four point and 9 point cribbing stacks ranging in stack load capacity between 58,800kgs and 132,000kg. The Dura Crib prime crib is an excellent alternative to timber dunnage and blocks used in jacking and stabilising task. The Dura Crib prime cribbing block is certified load rated with a working load limit of 60.8kg/cm2with a maximum working load capacity *58,800kg. Made from recycled plastic, the Dura Crib prime cribbing block is not only safer than timber, it is great for the environment. Timber blocks being used for jacking are a thing of the past.