Berg offers bolt mike transducers for our ultrasonic bolt mike with different options. We offer transducers in 3mm, 5mm, 10mm, 13mm and 20mm as well as in 2.25 MHz, 5 MHz and 10MHz. Please browse our categories to find the best products for you. If you have any questions about our ultrasonic test equipment, please give us a call at 1-847-577-3980 or send an email to firstname.lastname@example.org. Our knowledgeable staff is there to help.