Prop 65 WarningThe "square-throat" design of the 4400 series means greater capacity and more versatilityThe Wilton 4" 4400 model offers more throat depth than most conventional 6" clamps, and the 6" and 8" models yield 37% more throat depth than standard deep-throat C-ClampsLifetime WarrantyV grooved anvil allows secure holding of all materials including rounds, squares and flats.