4”, Natural Steel Barb 18lb Cable Tie, 1000 Bulk Pack
https://nsiindustries.com/product/4-natural-steel-barb-18lb-cable-tie-1000-bulk-pack/
PowerGRP cable ties are guaranteed rugged and powerful, with professional-grade strength and a versatile design. The steel barb locking mechanism provides a secure grip with unlimited positions in heavy-duty application.