Numberall can make special holding fixtures for all their marking tools. For this application, the customer required a mark on the inside diameter (ID) of a piece of pipe. The ID range is 4″ to 8″. That allow us to make a block to insert the stamp. The block was then mounted to a shank of heat treated steel with a handle. Because the ID was large, the block fits into the diameter. The spacing of the block, allows the customer to mark the same distance from edge of the pipe regardless of the diameter. The large shank allow the operator to push against the diameter of the pipe and move the fixture till the stamp locates on the ID. The operator then uses a hammer blow to make the impression. As always MADE IN THE USA!