A split bolt looks like a standard bolt with the exception that it is "split" down the middle. The split accommodates electrical wires, which the split bolt will hold in place when you tighten the hex nut fastened to the bottom of the bolt. Since split bolts are not insulated, you will need to insulate the final connection if you are using the split bolt to hold wires that are carrying electrical current. Electrical tape alone is not an efficient means of insulating split bolt connections.