DURA CRIB® Heavy Duty Construction Jacking and cribbing blocks are a purpose built tool designed to replace timber blocks that had traditionally been used to stabilise machinery and equipment used repair and maintenance or storage. The pyramid profile on all 4 surfaces provides a secure base and top that interlock the blocks at any angle when used in cribbing stacks. These blocks are ideal in high tonnage load bearing stabilising applications like large structures, bull dozers, scrapers, graders and alike. The DCHDC4410LB and DCHDC6710LB are perfect inclusion in service van tool kits as the are compact with high load bearing capacity. While the DCHDC4430LB and DCHDC6730LB provide large load bearing capabilities ideal for workshop stabilising tasks.