Pro Drill series Super Jumbo Cluster Hammer Drill, is designed to fulfill piling purpose on rotary drill rigs, especially under hard rock condition. We are the firstly and only one factory to produce this new products, This Jumbo Cluster Hammer adopts the typical square drive, which can match with most of the rotary drilling rig prevailing on the market. To overcome the short of traditional rotary drill rig - low drilling efficiency in hard rock formation, the PD Cluster Hammer Drill adopts cluster method to let several DTH hammers work together, which makes it possible to use small size DTH hammers drilling big size holes. And in this way, the work efficiency is greatly improved by dozens of times, compared to traditional rotary drill. According to the demand current market, we now launch 660mm, 800, 1000mm, 1200mm, 1300mm, and 1500mm diameter cluster hammer drill, and also we can customize specific sizes, according to particular demand of customers.