Rock Drilling T ools 4 www brunnerlay com Brunner Lay Intraset used for shaft sinking tunnel driving and mining where small holes are desired T apered Equipment used in shaft sinking tunnel driving and mining where small holes are desired The objective in using tapered drill steel and bits is to achieve the full utilization of the drill steel With integral drill steel if the chisel wears or breaks the entire unit is discarded whereas the tapered drill bits can be replaced or the steel reshanked or even retapered Rope Thread used for underground mining in production drilling longhole drilling and roof bolting applications T aper Face Style Applications Designation Single Pass Eliminates resharp ening may be more economi cal for some applications mainly broken rock for mations and rough conditions L0 Multi Pass Designed for multiple resharpenings until the full insert height is consumed again for broken rock formations and rough conditions M0 Button For faster penetration and improved fushing which increases overall production drilling M Rope Body Style Modifed Chisel Chisel Designed for dimensional stone applications as well as roof bolting for hole size control M P0 Round Designed for a smooth even hole size promotes fast penetration in tunneling and production F3 B0 CC Dome For reaming in a predrilled pilot hole G0 Drifting T unneling