Dawson Custom thresholds can be fabricated from 16-gauge Type 304 stainless steel or #464, 0.60" thick, naval brass. Dawson thresholds are designed with attached support channels, and can be manufactured 1/4" or 1/2" high, up to 120" long (one piece), to any specified width. Finish is #4 Satin. Woodscrew and rawl plug type fastener preparation is approximately 16" on center. Hardware preparation, return miters and door jamb notches are available.