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Suitable for traditional letterboxes (not suitable for modern styles - see description) 2 Different Sizes / Strengths. Fit rods up to 4.0mm or 4.5mm diameter. Full dimensions are shown in the additional photographs Suitable for horizontal and Vertical (Trinity style) Letterboxes One arm may have to be bent or shortened (For fitting instructions please see description below) To see our full range (organised by spring type and size) please click ‘visit the Northern DIY store’ by the title above