It was a simple, but revolutionary, innovation! Back in the year 1920, L.A. Macklanburg was tired of dealing with with the dust and dirt blowing in under his door. So he created the first form of weather-stripping, a very simple solution that inspired an industry! It was symbolic of the smart, refreshingly uncomplicated thinking that continues to define M-D Building Products today: quality that never wavers and innovation that never stands still. A family-owned business with more than 90% of their products manufactured in the USA, M-D Building Products weather-stripping, floor and tile trims, perforated aluminum sheets, digital levels, and caulking is preferred by consumers and industry professionals throughout the world! Please explore these links for more details, pricing & availability!