Dynadrill Button Bits extend covers gap breadth 3" and upwards up to 24". Dynadrill DTH Button Bits are accessible for all Major DTH Hammer Brands in Only Dynadrill Equipments Special Features: Computer analysis including laboratory trials should be used to optimize the specific number of buttons while well as their size including positioning throughout the bit front. Carbide has meant exactly designed to reduce the risk of button loss and button failure The configuration of the bit body including the frontal sludge grooves provides uniform flushing with reduces steel wash on both bit and the hammer. For More Details Visit Us: http://www.dynadrillequipment.com/button-bts.php Contact us: 9440048236 / 9440609036.