Increased ground clearance Fabricated steel blocks are stronger and offer a longer lifespan than cast blocks. Tapered to reduce drive shaft angle. Single 9/16" pin blocks. Backed by Rough Country's Lifetime Replacement Warranty Increased ground clearance Fabricated steel blocks are stronger and offer a longer lifespan than cast blocks. Tapered to reduce drive shaft angle. Single 9/16" pin blocks. Backed by Rough Country's Limited Lifetime Replacement Warranty.