Type:Toslink Optical Insert - White Calrad Electronics flush mount keystone inserts allow installers to create custom professional wall plates. Unlike Competitors, Calrad's inserts are recessed for a clean looking plate. This feed-through insert provides a smooth cosmetic look. The colored insert allows for quick and easy channel identification. **Please Note: Due to Calrad inserts larger than normal width, these inserts are only compatible with the plate styles shown below (Related Products).