The Special Tool Steel Straight Edges has hardened, precision ground and lapped. Milhard Sales Pvt. Ltd. Offers Special Tool Steel Straight Edges. Milhard Sales Pvt. Ltd. Manufactures Engineer`s Squares including solid Beveled Edge type, Dial Comparator Stands, Thickness Gauges, Precision Machine Vices, Knife Straight Edges, Steel Parallels, Precision Block Levels, Hardened Steel Vee Blocks, Magnetic Dial Stands, Stereo Microscopes, etc. The Special Tool Steel Straight Edges of Series - KE when it is placed against a well illuminated background on the surface under examination, any white light visible shows the deviation in flatness.