IRWIN QUICK-GRIP 3/4" Pipe Clamp, 224134 Innovative clutch system eliminates the need for threaded pipe Large feet offer more stability and clearance between handle and worktop Ergonomic handle offers easier clamping and reduced hand fatigue Large clutch plates release easily for increased durability and dependability Built to handle 3/4" pipe, it features a 1-7/8" throat depth