All in one assembly - insulate, strain and connect fence wires. Integrated joint clamp allows direct attachment of wires and power connection. Sold as a pack of 20. ? Tighten up to 4 mm/15-gauge fence wire ? 12-tooth spool for fine adjustment and easy tightening ? Insulated body provides added protection from corrosion ? Heavy-duty, robust design backed by a 10-year warranty Manufacturer's Part Number: # G74313 ? WARNING: This product can expose you to chemicals including Lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.