Lock Contour Gauge Knuckle Side As Per Drawing No. Wd - 84073-S-57-Rc With Calibration Cer Tificate From Nabl Certified Firm,Hardened Steel, (Min 50-55 Hrc) And Gauge Must Be Rust-Proof Preferably Made Up Of Ss. Make: Pie, Prasad, Ganapathy Or Equivalent ]