Berg offers ASME basic calibration blocks in a 1 1/2 inch thickness. These blocks come in steel, aluminum and stainless steel. Please browse our products to find the best one for you. If you have any questions about Berg and our ultrasonic flaw calibration test blocks, please contact us at 1-847-577-3980 or send an email to info@bergeng.com. Our knowledgeable customer service staff is happy to assist you.