A well bore reaming device, comprising: a drill string a bit coupled to the drill string; a bottom hole assembly coupled to the drill string; a bottom eccentric reamer coupled to the drill string; and a top eccentric reamer coupled to the drill string; wherein the bottom and top eccentric reamers are axially spaced apart and diametrically opposed on the drill string; characterised in that: the bottom eccentric reamer has four sets of cutting elements, wherein each set of cutting elements is arranged on a blade extending radially from the drill string and, counter to the direction of rotation, a first blade extends a first radial distance from the drill string, a second blade extends a second radial distance from the drill string greater than the first radial distance, a third and fourth blade extend a third radial distance from the drill string greater than the second radial distance; and the top eccentric reamer has four sets of cutting elements, wherein each set of cutting elements is arranged on a blade extending radially from the drill string and, counter to the direction of rotation, a first blade extends a first radial distance from the drill string, a second blade extends a second radial distance from the drill string greater than the first radial distance, and a third and fourth blade extend a third radial distance from the drill string greater than the second radial distance. a drill string a bit coupled to the drill string; a bottom hole assembly coupled to the drill string; a bottom eccentric reamer coupled to the drill string; and a top eccentric reamer coupled to the drill string; wherein the bottom and top eccentric reamers are axially spaced apart and diametrically opposed on the drill string; characterised in that: the bottom eccentric reamer has four sets of cutting elements, wherein each set of cutting elements is arranged on a blade extending radially from the drill string and, counter to the direction of rotation, a first blade extends a first radial distance from the drill string, a second blade extends a second radial distance from the drill string greater than the first radial distance, a third and fourth blade extend a third radial distance from the drill string greater than the second radial distance; and the top eccentric reamer has four sets of cutting elements, wherein each set of cutting elements is arranged on a blade extending radially from the drill string and, counter to the direction of rotation, a first blade extends a first radial distance from the drill string, a second blade extends a second radial distance from the drill string greater than the first radial distance, and a third and fourth blade extend a third radial distance from the drill string greater than the second radial distance. the bottom eccentric reamer has four sets of cutting elements, wherein each set of cutting elements is arranged on a blade extending radially from the drill string and, counter to the direction of rotation, a first blade extends a first radial distance from the drill string, a second blade extends a second radial distance from the drill string greater than the first radial distance, a third and fourth blade extend a third radial distance from the drill string greater than the second radial distance; and the top eccentric reamer has four sets of cutting elements, wherein each set of cutting elements is arranged on a blade extending radially from the drill string and, counter to the direction of rotation, a first blade extends a first radial distance from the drill string, a second blade extends a second radial distance from the drill string greater than the first radial distance, and a third and fourth blade extend a third radial distance from the drill string greater than the second radial distance. <EOS>