CLAMP RISER #261 1 1/4|Anvil's #261 carbon steel riser clamps are available in a wide range of sizes: 3/4" through 24" and can be furnished plain, galvanized or epoxy-coated. They are designed for the support of stationary steel pipe risers, cast iron pipe or conduit (but not hanger rods). Each clamp is fitted and bolted preferably below a coupling, hub or welded lugs on steel pipe. Bolt torques should be per industry standards. This clamp is designed for standard steel pipe O.D. and this must be considered in sizing the riser for other types of piping.