Abstract: A tie strap structure for electric wiring is provided. The tie strap structure includes a tie strap member having a flexible strap for encircling a bundle of wires and a buckle at one end of the strap for engaging the other end of the tie strap to secure the tie strap in place on a bundle of wires. A cross member is provided on the tie strap intermediate the ends thereof. A mounting bracket is provided including an elongated slot. The cross member is slidably retained in the slot. The slot extends in the direction of the length of a bundle of wires when the tie strap structure is mounted thereon. The fastener extends outwardly from the mounting bracket for reception in an opening provided in a support structure to which the tie strap structure is to be attached. The mounting bracket is slidable with respect to the cross member lengthwise of the bundle of wires to permit alignment of the fastener with the opening without stretching the bundle of wires.