Treads:
Treads are attached to center column and you will not see hubs, bolts or nuts. The smooth plate step is used for carpet which is applied to the surface with contact cement. Pan types are used for concrete, terrazzo, tile, marble or wood. Treads can be made any degreee for better starting location. Other materials available are metal and wood.
Steel Smooth
#100 12 Gauge Steel
#102 3/16"		 Steel Checkerplate
#110 12 Guage
#102 3/16"		 Steel Pantype
#120 12 Gauge Steel
#122 3/16"		 Steel Perforated
#165 12 Gauge Steel		 Abrasive Surgace
#166 12 Gauge Steel
#167 3/16"		 Rubber Covered
#170 12 Gauge Steel
#172 3/16"
#174 3/16" Alum.
Steel Bar Grate
#130 1"x3/16" Steel
#132 1"x3/16" Alum.		 Steel Bar Grate w/ Nose
#136 1"x3/16" Steel
#138 1"x3/16" Alum.		 Steel Radial Grate
#133 1"x3/16" Steel
#134 1"x3/16" Alum.		 Steel Radial Grate w/ Nose
#135 1"x3/16" Steel
#137 1"x3/16" Alum.		 Arc Pattern
#181 1"x3/16" Steel
#182 1"x3/16" Alum.		 Filigree Pattern
#183 1"x3/16" Steel
#184 1"x3/16" Alum.
Traditonal Pattern
#185 12 Gauge Steel
#186 3/16" Steel		 Oak Wood w/ Nose
#140 1"
#142 11/2"
#144 1 1/4"		 Oak Wood w/o Nose
#141 1"
#143 11/2"
#146 1 1/4"		 Oak Wood w/ Rubber
#145 1"
#147 11/2"
#148 1 1/4" w/ Nose
#149 1 1/4" w/o Nose		 Alum. Checker Plate
#150 3/16" Alum.		 Stainless Steel
#160 Smooth
#161 Patterned
#162 Perforated
#164 Checkerplate