Abstract: A second stage drill bit includes a main body, a connection adapter, and a plurality of teeth. The connection adapter is disposed on an upper portion of the main body. The connection adapter is configured to detachably couple the second stage drill bit to a drilling device and to detachably couple the second stage drill bit to a primary drill bit. The plurality of teeth are disposed on a bottom edge of the main body. The plurality of teeth are configured to penetrate a surface during a drilling process. Upon coupling the second stage drill bit to the drilling device and the primary drill bit, the second stage drill bit is disposed in an area between the drilling device and the primary drill bit, and a portion of the primary drill bit is surrounded by the main body.