15 Inch Locking Ties (Used for 4" Diameter Piping). The PTP Stainless Steel Locking Ties are simple to use, have a very high loop tensile strength (150 pounds), and since they are made from 304 stainless steel, are perfect for use in harsh chemical and high temperature environments. The unique ball locking mechanism on these cable ties are extremely durable yet can be installed easily and quickly. The locking ties are used to secure heavy duty and high temperature sleeving products such as our Exhaust Wraps.