Insert, holder, and cutting tool using said insert and holder

A cutting tool, comprising:

• a holder with an insertion hole at a tip end part of the holder and with an adjustment member;
• an insert having a rod-shape, the insert having a first end and a second end and being inserted with its second end in the holder through the insertion hole, the insert further comprising:
• a shank part comprising a first end, a second end, a peripheral portion extending over some distance between the first end and the second end, and a center axis;
• a first cutting edge formed at the first end of the insert and a second cutting edge formed at the second end of the insert;
• a first rising surface located between the first cutting edge and the peripheral portion of the shank part, said first rising surface being inclined in a direction away from the first cutting edge from a position closer to the center axis towards the outer peripheral portion of the shank part;
• a second rising surface located between the second cutting edge and the peripheral portion of the shank part, said second rising surface being inclined in a direction away from the second cutting edge from a position closer to the center axis towards the outer peripheral portion of the shank part;
• a first rake face extending from the first cutting edge at the same inclination orientation as the second rising surface;
• and
• a second rake face extending from the first cutting edge at the same inclination orientation as the first rising surface;
• wherein
• the adjustment member is in abutting contact with the second rising surface of the insert for determining the position of the insert with respect to the holder, a threaded hole extends from an outer peripheral surface of the holder into the insertion hole, and a screw member is threaded into the screw hole to press and clamp the outer peripheral portion of the shank part of the insert by a front end of the screw member.