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Concrete Plain Slab Bolster Upper With Gray Plastic Coated Legs - Continuous Rebar Chairs (5" x 5 ft x 3") concrete forming supplies Wanna fill a bag withElevate Rebar 3" Properly Position and Support Rebar In Concrete Slabs Sandbaggy Concrete Slab Bolster Upper with Grey Plastic Coated Legs (also known as a beam bolster) provides great strength and durability with its 6 gauge steel and continuous design. The gray plastic tipped legs protect the underlying surface from scratches and damage and prevent the slab bolster from slipping or sliding. Its continuous design ensures even support and spacing of