Pair of 27 by 48-inch extension springs with clipped ends for 8-foot doors. Oil-tempered steel construction. Clipped ends grip the bracket tighter than open or S-hook styles, which some techs prefer for the added security. Pick the right lift rating in the dropdown based on your door weight. The 27 by 48 dimension is specifically for 8-foot standard-lift setups, so confirm your door height first. Don't mix clipped-end springs with S-hook springs on the same door. Replace both sides at the same time for even balance and to avoid one side wearing faster than the other.