Collar Strap Details: Do you need to replace your dog’s nylon collar? If it’s faded, frayed, stained…or you just want a new color – replace it with a new high quality durable nylon collar.These OEM collars are perfectly suited to mount your Invisible Fence receiver. The pre-drilled mounting holes are perfectly sized and spaced for a perfect fit. 3/4″ Wide. Fits Invisible Fence Brand pet fence receivers (All Models EXCEPT MicroLite) X-Small – Adjusts 8”-11” Small – Adjusts 10”-13” Medium – Adjusts 13”-17” Large – Adjusts 17”-23” X-Large – Adjusts 23”-31” (Black & Green are not available)