AOP Precast produced the open coil insert which is a standard coil connected to an expanded coil by resistance welded struts. The open coil insert are available in 3/4”, 1”, 1-1/4” and 1-1/2” diameters with two to six struts, depending on the model. Refer to the Table for sizes, dimensions and safe working loads. The open coil insert is also available with a mounting washer for applications requiring the insert to be nailed to the form. Minimum spacing of inserts shall be double the minimum edge distance.