Irwin Irwin 224212 Pipe Clamp 1/2 Inch Key Features;Innovative clutch system eliminates the need for threaded pipe;Larger feet offer more stability and clearance between handle and worktop;Larger more ergonomic handle offers easier clamping with reduced hand fatigue;Larger clutch plates allow for easier release and increased durability and dependability;Pipe clamps throat depth 1-1/2 inches pipe 1/2 inches New clutch system eliminates the need for threaded pipe. Larger feet offer more stability and clearance between handle and worktop. Larger more ergonomic handle. Larger clutch plates allow for easier release and increased durability and dependability.