Crosby makes the HR-500 series of hoist rings explicitly for the lifting and placement of steel plates (aka trench covers) used to cover trenches in streets. They provide a standard fitting to be used in place of products not designed for trench cover applications. Coil threads make installation / removal very quick and easy. They are very durable, with all components being made of alloy steel. The bail is forged which makes it very long-lasting and tolerant of tough field conditions. You achieve a full 100% rating regardless of the lifting angle, as well as 360º swivel and 180º pivot action. Finally, every unit is equipped with an RFID tracking chip for easy tracking and inspection. Safety factor of 5:1. Available in capacities of 5,000, 10,000 & 15,000 lbs. They fit plates from 3/4 - 1-1/2" thick.