Grizzlar GTN-521 Garden Tractor/Snowblower Net/Diamond Style Alloy Tire Chains 4.00-4, 4.10-6, 13x4.00-6 Net style chain for excellent traction Much more contact of the chain with the road than with ladder style chains Manganese steel for longer durability. Fits: 4.00-4, 4.10-6, 13x4.00-6 tires. Especially suitable for tires with very aggressive tread D-shaped links for increased traction. Sold in pairs.