PowerGRP GRP-18500 Cable Tie 18 IN 50Lb Blk (100Pk)
https://testing.nsiindustries.com/product/18-black-general-purpose-50lb-cable-ties-100-pack/
PowerGRP cable ties are guaranteed rugged and powerful, with professional-grade strength and a self-locking design. The traditional serrated locking mechanism provides a secure grip and the bent tip allows for easy insertion.