Abstract: A clamping apparatus includes a first member defining a slot aperture with a wider portion and a narrower portion, and a second member with an arcuate portion for extension about an object to be clamped between the members. The second member has an end portion defining a plurality of pairs of notches, the notches of each pair being defined in opposite side edges of the end portion and being adapted to engage in the slot aperture of the first member upon insertion and rotation thereof relative to the first member. Fastener means, preferably a threaded fastener, is adjustable in position relative to the first member to retain and space the second member portion from the first member a selected distance to clamp an object of particular size between the first and second members.