Wilton 14375 4406, 4400 Series Forged C-Clamp-Extra Deep-Throat, Regular-Duty, 0-Inch-6-Inch Jaw Opening, 5-Inch Throat Depth Drop-Forged, Regular-Duty, Extra Deep-Throat The "Square-Throat" Design Of The 4400 Series Means Greater Capacity And More Versatility The Wilton 4-Inch 4400 Model Offers More Throat Depth Than Most Conventional Clamps