Coil Loop Insert is a versatile insert typically used for structural connections and as anchors for the suspension of pipes and/or other mechanical equipment. See the table below for available bolt diameters and lengths. Theinert offers plain or hot dip galvanized finishes. Safe working loads shown are based on 3,000 PSI concrete with a 3:1 safety factor. Although simple in design and fabrication, the B16 Straight Coil Loop Insert is highly efficient for lifting and handling precast concrete elements. Dayton Superior Coil Loop Inserts are made of a single looped wire welded to a helix coil. They are available in 1/2" to 1" diameters suitable for many concreting applications.