Normal - Springs butt up on each side of corner. This is the most common corner configuration.

Normal with Diagonal - In addition to the springs on each side of the corner, there is an extra spring mounted diagonally. These extra corner springs are typically longer than other springs.

Diagonal Only - Each corner has only a diagonal spring with no additional springs on each side of the corner. These corner springs are typically longer than other springs.

Crowded - Springs are spaced evenly along the bed’s sides except close to the corners. Beside each corner, the first and third springs are crowded close to the second spring.