When John Kramer decided to found John Kramer's Fabrications, Inc. in 1989, he did so with over 20 years of fabricating experience. And when John Kramer's Fabrications, Inc., located in the rural community of Bernville, Pennsylvania, became a reality, John made sure that his company stood for quality and customer satisfaction. So it's not surprising that today, John Kramer's Fabrications, Inc. has established a national reputation as the source for custom shower bases made of the finest material - DuPont CORIAN®. Pennsylvania Home Improvement Contractor Registration Number: PA007324. Effective July 1, 2009.