Terrier FBK 3 Ton Vertical Beam Lifting Clamp - 851100 Flat Hook Ratchet Straps they define design factor as

they define design factor as the "ratio of the breaking strength to the working load limit

or create custom coverage for a specific application

Nylon endless slings are an economical choice because the design allows the user to move the contact area with each use which decreases wear and tear on the sling

T hook and R hook to easily tie down any vehicle (R hook- Ford

these sliding winches deliver the same strength you expect

Terrier FBK 3 Ton Vertical Beam Lifting Clamp - 851100 Flat Hook Ratchet Straps they define design factor asFeatures: Designed for lifting, turning and transporting steel beams. The shape of this lifting shackle maintains the equilibrium of the beam to keep the flanges vertical so the beam can be easily stacked or positioned. Minimum working load limit is 10% of the maximum working load limit. Individually proof tested to 2 times the working load limit (test certificate included). California Residents: WARNING