An injectable substance delivery device comprising: at least one needle having a length sufficient to penetrate a skin surface of a patient to an intradermal depth for infusing a substance; a limiter for controlling a needle insertion depth, wherein said limiter controls a maximum insertion depth of said needle into said skin surface without restricting complete insertion of said needle; and a flexible holder comprising a stabilizer and a spring member , said stabilizer comprises a continuous ring member concentrically located about said limiter, characterized in that said stabilizer being flexibly coupled to said limiter by said spring member at a first distance from said limiter for applying an increased application force of said limiter while preventing distortion, compression, or thinning of tissue in a vicinity of a needle insertion site such that said needle length and said limiter determine the depth at which said infusion is delivered, wherein said first distance is determined based upon an amount of said substance to be infused and a diameter of said limiter, where said limiter is preloaded toward said skin relative to said stabilizer, and wherein said limiter is configured to have a variable extension difference with respect to said stabilizer extending along an axial direction such that said needle, limiter, and stabilizer contact said skin surface in that order, wherein said variable extension difference comprises a second distance between said limiter and said stabilizer, wherein said second distance is determined based upon a sharpness of said needle and said diameter of said limiter. at least one needle having a length sufficient to penetrate a skin surface of a patient to an intradermal depth for infusing a substance; a limiter for controlling a needle insertion depth, wherein said limiter controls a maximum insertion depth of said needle into said skin surface without restricting complete insertion of said needle; and a flexible holder comprising a stabilizer and a spring member , said stabilizer comprises a continuous ring member concentrically located about said limiter, characterized in that said stabilizer being flexibly coupled to said limiter by said spring member at a first distance from said limiter for applying an increased application force of said limiter while preventing distortion, compression, or thinning of tissue in a vicinity of a needle insertion site such that said needle length and said limiter determine the depth at which said infusion is delivered, wherein said first distance is determined based upon an amount of said substance to be infused and a diameter of said limiter, where said limiter is preloaded toward said skin relative to said stabilizer, and wherein said limiter is configured to have a variable extension difference with respect to said stabilizer extending along an axial direction such that said needle, limiter, and stabilizer contact said skin surface in that order, wherein said variable extension difference comprises a second distance between said limiter and said stabilizer, wherein said second distance is determined based upon a sharpness of said needle and said diameter of said limiter. <EOS>