TEKTON 9-PC. 3/4"-DRIVE DEEP IMPACT SOCKET SET features: Drop Forged, Heat Treated Chrome Vanadium Steel Construction, Opti-Drive Socket Design Contacts Only Flat Surfaces of Fastener Head to Eliminate Rounding Off Corners, 6-Point Socket End with Beveled Nose to Help Guide Socket Onto Fastener, Durable Black Oxide Finish Resists Corrosion, Hole on Socket Locks on to Drive Tang v Keeps Socket from Slipping Off or Sticking to Fastener, 8-pc. 3/4"-Drive Impact Sockets (Metric): 27, 29, 30, 32, 33, 34, 36, 38mm, 1-pc. Molded Plastic Case.