A clamp device having a main body and a pivotable, pipe clamping holder. A first bolt and nut connect the main body and the pivotable holder and allow them to pivot with reference to the first bolt. Another bolt is pivotally connected to the main body and can be swung in a groove in the second holder and the other nut is held in the groove by a respective nut. The two bolts cooperate to clamp a pipe. An arm to one side of the second holder and the main body is operable for pivoting the second holder around the second bolt to selectively open or close the clamping against the main body. A spring on the first bolt biases the second holder contrary to the force applied to the arm. The main body extends to a further clamping hole. An additional pipe holding, adjustable angle member may be installed in the further hole.