The P15 Type M Connector Pin is available in 4-3/4", 5-1/2" and 6-1/4" lengths. The P14 Type L Connector Pin is available in lengths of 4-3/4", 5-1/2", 6-1/4" or 7-1/2". Maximum pin spacing is 4'-0" on center, or one pin for each 5 sq. ft. of panel area. However, pins should be spaced at 24" maximum on center along the panel edges.