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Free Ground Shipping. Ancra Winch - Porta-Winch, 1 pack.Turn stake pockets into strap anchor points. Ancra has created a way you can turn standard stake pockets into solid anchor points for securement straps. Our DOT and FMCSA compliant 3-Bar PortaWinch and PortaAnchor offer a versatile system that allows you to position the tie down straps anywhere along either side, front or back of the trailer, using stake pockets that best accommodate your load. Patented No 6,626,621. Standard outward off-set.