Product Introduction The T45 76mm Retrac Button Bit is a threaded top hammer rock drilling bit designed for mining, quarrying, tunneling, bench drilling, underground long-hole drilling and other demanding rock drilling applications. Featuring a T45 threaded connection, a 76 mm drilling diameter and a Retrac skirt design, it provides reliable drilling performance in medium to hard rock formations. The Retrac skirt design is particularly useful in fractured, fissured and broken