S e c t i o n 1 0 - P a g e 1 4 May 2013 Surface Contr ol Plates 23" and 19" General Information • the 23" diameter is "special" or der • the 19" diameter is stock pr oduction • all plates have the "r olled edge" to pr ovide for safe handling • lar ge diameter plates for surface contr ol • these plates a re to be used in conjunction with a r oof bolt and r oof plate 23" Description • 23" diameter with a 1 3 / 8 " center hole • available in a variety of mill thicknesses fr om 0.022" to 0.050" cold r olled or coated steel 23" 19" 19" Description • 19" diameter with a 1" center hole • 19" diameter with a 1 3 / 8 " center hole • available in a variety of mill thicknesses fr om 0.022" to 0.050" cold r olled or coated steel www .dsiundergr ound.com