Helps protect your cargo against tampering and theft. Made from high-strength polyethylene, measures 3/8" x 7-1/2". Break strength: less than 500lbs of force to disengage, features 60lb tensil strength/pull-apart force. Stock selas are hot-stamped with JJKeller name and numbered consecutively with our choice of starting number. *Must be purchased in increments of 20.