Notched Bar Cow Trainer is made entirely of stainless steel for long life and durability. Spring-loaded "LUDWIG"-style hanger clip simply folds down to attach to the wire. May be used with standard number 12 or number 14 electric fence wire. To install string electric wire 18" to 22" from back of stanchion line. Stainless steel replacement parts hanger clip bars and adjusting spring clip are available separately.