Doc's 45° Seismic General-Purpose Angle Clip also has a 1/2 in. hole which can be use with a 1/2 in. expansion anchor or concrete screw with ceiling wire tied to the 3/8 in. hole. The 3/8 in. hole can be used with a 3/8 in. expansion anchor or concrete screw with ceiling wire tied to the 1/2 in. hole.