Ring Bit has similar function with Overburden Drill Bit but Ring Bit can be utilized on the solid ground. Mostly in Hong Kong or Taiwan, it is used with Casing for the horizontal drilling. After the drilling, the pilot bit will be retrieved but the Ring Bit is usually left inside the hole with Casing.
|Model||Outside Diameter(mm)||Casing Outside Dia.(mm)||Suitable Hammer Type|
|Ring bit||Pilot Bit|
|[RC]DWRB-609||645||573||609.6||DW410 / DW470|