What do I need to know in order to purchase the correct size of hydraulic hammer? RJ Hydraulic Hammers and Heavy Parts has answers to this question. First of all, there are many things to consider before your purchase. For example, on what size excavator will you mount your hydraulic hammer? What material do I need to break? Is my operator experienced? The answers to all of these questions will help us to help you choose the proper size of hammer to work best on your machine. Please call us to discuss your specific equipment needs. We are always happy to answer any of your questions. Your technical Hotline is 888-651-0187, or if Outside the US 1- 727-215-4924. Please call us with your questions, visit our website at www.besthammers.com or post your questions on this blog. We are here to help!