Abstract: A drill bit suitable to be connected to a drill string for drilling a borehole into an earth formation, the drill string having a central longitudinal axis, the drill bit comprising a bit body connectable to the lower end of the drill string, and a cutting member provided with cutting devices at the outer surface thereof, the cutting member being rotatable relative to the bit body about a longitudinal axis of rotation extending eccentrically relative to the central longitudinal axis of the drill string, between a first rotational position[ and a second rotational position, whereby in said second rotational position the cutting devices arranged at a larger radial distance from the central longitudinal axis of the drill string than in said first rotational position.

Abstract: A method of forming a profile (10) in a section of tubing (12) comprises; providing an expander device (14) having at least one radially extendable expander member (22), positioning the device (14) at a predetermined location in the tubing (12); and extending the member (22) to deform the tubing (12) to create a profile (10).