A method of inspecting a substantially round hole in a material, the method comprising: feeding a probe (100, 200) axially into the substantially round hole until the probe (100, 200) completely passes through the substantially round hole while the probe (100, 200) is activated, the probe (100, 200), wherein the probe includes a pair of flexible sheets (110, 234) shaped and biased to substantially conform with a portion of an interior of the substantially round hole and a plurality of sensors (122, 220) disposed on each of the flexible sheets (110, 234), each sensor (122, 220) configured to transmit a non-destructive signal including one of an eddy current signal and an ultrasound signal into the material for inspecting the substantially round hole, the method further comprising rotating the probe (100, 200) around a primary axis of the substantially round hole after feeding the probe (100, 200) completely through the substantially round hole; removing the probe (100, 200) axially from the substantially round hole after rotating the probe (100, 200) at least ninety degrees while the probe (100, 200) is activated; and compiling at least one of eddy current data or ultrasound data about the hole from the feeding of the probe (100, 200) axially into the substantially round hole and the removing of the probe (100, 200) axially from the substantially round hole, wherein feeding the probe axially into the substantially round hole comprises positioning the pair of flexible sheets symmetrically within the hole and rotating the probe (100, 200) comprises rotating the probe at least ninety degrees around the primary axis of the substantially round hole while the probe is activated. feeding a probe (100, 200) axially into the substantially round hole until the probe (100, 200) completely passes through the substantially round hole while the probe (100, 200) is activated, the probe (100, 200), wherein the probe includes a pair of flexible sheets (110, 234) shaped and biased to substantially conform with a portion of an interior of the substantially round hole and a plurality of sensors (122, 220) disposed on each of the flexible sheets (110, 234), each sensor (122, 220) configured to transmit a non-destructive signal including one of an eddy current signal and an ultrasound signal into the material for inspecting the substantially round hole, the method further comprising rotating the probe (100, 200) around a primary axis of the substantially round hole after feeding the probe (100, 200) completely through the substantially round hole; removing the probe (100, 200) axially from the substantially round hole after rotating the probe (100, 200) at least ninety degrees while the probe (100, 200) is activated; and compiling at least one of eddy current data or ultrasound data about the hole from the feeding of the probe (100, 200) axially into the substantially round hole and the removing of the probe (100, 200) axially from the substantially round hole, wherein feeding the probe axially into the substantially round hole comprises positioning the pair of flexible sheets symmetrically within the hole and rotating the probe (100, 200) comprises rotating the probe at least ninety degrees around the primary axis of the substantially round hole while the probe is activated.