The rebar drivers enable you to drive rebar without destroying the top of the bar. The driver fits over the bar protecting the top surface because it is never hit by the hammer. It stays round, making it easy to put Permamarks (#3000, 4000, 5000, 6000) or Terrasign (#TS375, TS500, TS625, TS750) caps over the bar.
#439A fits 3/8" and 1/2" rebar
#438A fits 5/8" and 3/4" rebar
Made of hardened 4140 tool steel so it won't splinter. The driver is approx. 5" long and weighs 2 lbs.