PA Insert is now offering Polylok brand Locking Wheel Chairs.  Polylok chairs lock in place and accommodates multiple sized bar. Be confident knowing that your rebar will stay where you place it. Use our 1”, 1½”, 2” and 3” chairs for all concrete work including precast, utility vaults, slabs, barriers, foundation work and bridges. Use one of our Polylok ratchet style chairs instead of three of the competitors.