These slat supports are 12 guage thick and are lasered and accurately formed for a precision fit. These feature a tight 2.25" spacing and have a opening for 1/8" flat bar. Slat supports are 55"s long and are 2"s high. (For example 4x4 tables can utilize 3 of these for "U" shapes slats up to 3"s high for long lasting accurate sheet support). 4x8 uses 6 for "U" and 5x10 uses 7 for "U" shaped slats configuation. (Note 5x10 requires some cutting of the 7th support for complete table install). Special shipping rates do apply an additional invoice will be sent.