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The Monstro-Clamp 4" fastens to those really big, (2-3/8" OD to 4" OD), pipes. CNC cut from solid one inch thick aluminum plate. 1/2"-13 × 4″ square head bolt.
To avoid breakage, do not use excessive force when tightening screws or bolts. Do not use any broken, cracked or worn out items.