The original, and still the best, top-of-the-line satin-chrome micrometers. Silky smooth, precise operation and functional design combine to continue the tradition of the Brown & Sharpe® micrometer as the basic tool of choice for quality minded individuals. Carbide measuring faces,convertible “friction” to “feel” thimble sleeves, easy reading satin-chrome finish and spindle locks come standard. T20277 and T20278 have insulated frames.