Product Introduction The T38 102mm Retrac Button Bit is a large-diameter threaded top hammer rock drilling bit designed for demanding mining, quarrying, tunneling, construction and rock excavation applications. Featuring a T38 threaded connection and a 106 mm drilling diameter, this Retrac button bit is built for drilling applications that require a larger borehole diameter. The Retrac skirt design helps improve drill-bit retrieval and reduces the risk of sticking when