Purchase Estimator Enter the information below and press Estimate. NOTE: Enter numbers only. 1.5" Rebar Chair (911) 3" Rebar Chair (912) 3-Bar Footer Stand (924) 2-Bar Footer Stand (928) 2" Steel Mesh Chair (944) 2″ Steel Mesh Chair (944) Length of Slab (feet) Width of Slab (feet) Estimate # of Chairs Required Strength. Quality. SOLUTION.