Elements 8 Sets Corner Connectors for 4 Shelves Corner connectors attach a basic unit to the second unit at a 90? angle or between two units to form a U shape. A set of corner connectors are needed for each shelf. When using corner connectors, weight-bearing capacity will decrease to 400 lbs. per shelf. Corner connectors are recommended for use with shelves 24&rdquo - 48&rdquo long-only. Elements 8 Sets Corner Connectors for 4 Shelves Corner connectors attach a basic unit to the second unit in a 90? angle or between two units to form a U shape. A set of corner connectors are needed for each shelf. When using corner connectors, weight-bearing capacity will decrease to 400 lbs. per shelf. Corner connectors are recommended for use with shelves 24&rdquo - 48&rdquo long only. Warranty 1 year