The Hercules 3″ Rebar Chair #912 is perfect for commercial concrete applications that require 6″ to 8″ concrete slabs. Designed for #4 and #5 rebar, the #912 has a 3″ clearance from the ground to the bottom bar. Simply snap the rebar into place. No wire tying is necessary. Designed for maximum concrete flow in and around the chair, the #912 is your solution to help you “get the job done right!”