The new Polylok Concrete Bolsters allow you more flexibility when stacking rebar. Our concrete bolsters are available in 44″ lengths and can accommodate 3/4″, 1″, 1-1/4″, 1-1/2″, 1-3/4″, 2″, 2-1/4″, 2-1/2″, 2-3/4″, 3″ heights (coming soon 4″ & 5″). Our bolsters can easily be fastened together for longer lengths. Unlike any Concrete Bolsters on the market, the Polylok Concrete Bolsters can be stacked into a multi-level configuration, meeting specific height requirements. We are adding another quality product to our already extensive line of top quality rebar spacers.