Profile: Wm. Whiteley Limited designs and manufactures interior & exterior signage, wayfinding & sign systems. Our services include product design, wayfinding & sign system planning, graphic design, prototyping, manufacturing and installation services. Our switch sign holder is a simple, tamper-resistant solution for displaying changeable paper inserts. Switch signs are ideal for use in hospitals, transportation terminals or any public spaces where access to sign contents must be controlled. Our sign holder is made of 2 mm non-glare acrylic.