Turtle Plastics Hybrid CribPopular with firefighters and repair technicians working on small equipment, the Hybrid Crib is the new standard in light application plastic cribbing blocks. This block has two surfaces in one crib: Pyramid design securely interlocks; the Lincoln log style sides allow for additional stability and multiple stacking configurations for vehicle extrication cribbing. Part # 44PL 18 Dimensions: 4 x 4 x 18 Product Unit Weight: 6lbs. Light duty capability.