B&D Manufacturing Blocking Kits are lightweight cribbing for heavy epuipment, replacing traditional wood cribbing. Engineer certified, a single block stacking up to a maximum of 24 in (610 mm) can support up to 50 tons (45,000 kg). Crib-style blocking to the same height can support up to 100 tons (91,000 kg). Request Quotes at rfq@bdmfg.com