T45 102mm Flat Face Ballistic Button Bit Standard Body The T45 102mm Flat Face Ballistic Button Bit is a threaded top hammer rock drilling bit designed for demanding drilling applications in mining, quarrying, tunneling and construction. It features a T45 threaded connection, 102 mm (4 inch) diameter, flat face design and standard body. The ballistic carbide button configuration provides an effective cutting profile for rock fragmentation, while the flat face design offers a