Concrete Reinforcement Unit # 9999012 REBAR Reinforcing Steel Bars – Grade 60 In-stock sizes: #3, #4, #5, and #6. 20-ft. lengths. ASTM Standard Reinforcing Bars Grades and Minimum Yield Strengths Rebar Covers Exposed rebar, pipe, threaded rod, shebolts, etc., create potential hazards which can result in employee injury and lost time.