Abstract: Disclosed is a clamping device having a locking type mechanism which is particularly adaptable for use by well drillers, well repairmen and pump installers in securely holding pipe. The device comprises a base member having a bore and having an attached jaw, a sliding member partially located within the bore of the base member, a jaw attached to the portion of the sliding member outside the bore of the base member. The jaw on the sliding member is adapted to cooperate with the jaw attached to the base member to clamp about an object. The device further includes a clamping mechanism including a lever pivotably attached to the base member at a point on the arm spaced from the end of the lever, and a connecting linkage pivotably attached near the end of the lever and to the slidable member.