Factory accuracy: +/- 2% . Reliability of mechanism: 50,000 cy cles. Click wrenches with dual Ibf.in or Ibf.ft and N.m graduation . Reversible model. Full metal wrenches with knu rled handle. Numbered wrenches supplied with ISO 6789 calibration certificat e. Features High QUality Product Specifications L [mm] 379 Attachment 9 x 12 Box BP.D2 Capacity [lbf .in] 200 - 1000 Square [in] 3/8