metal single slotted standard universal for shelving. 1/2" with 1" on center. On center dimension from counter-sunk screw hole to counter-sunk screw is 12". A heavy duty metal single slotted standard universal. Use for heavy duty shelving. Fits 1" shelving with 2" on center. Screws placed 12" apart. Surface mount Imperial Line slotted standards. IF YOU ARE LOOKING FOR AN 5', 6', 7', or 8' STANDARD PLEASE CALL TO ORDER