Type of clew, also called an Easy Trim Clamp, as ropes may be tightened, but not loosened, without removing the load and opening the clamp via the wingnuts.
Steel Plate Clews / Carriages, Clews, Trim Clamp, Rigging & Hoists / Rope & Rigging Hardware / Home - Mutual Hardware
Steel Plate Clews / Carriages, Clews, Trim Clamp, Rigging & Hoists / Rope & Rigging Hardware / Home - Mutual Hardware