ProTech Automatic Knives Defiance Double Action Hidden Release. Each Pro-Tech Knives DEFIANCE Double Action automatic knife is fitted with a DLC black coated pokcet clip for tip down pocket carry. The ProTech Automatic Knives Defiance Double Action Hidden Release knife handles are T6-6061 aircraft aluminum with various color G-10 inlays. EXCLUSIVE new patented double action mechanisme, totally converted and only available from Pro-tech, the Defiance Double Action can be folded open with the thumb stud for super smooth one handed opening - or press the front corner of the inlay (the inlay will flex and with enough force push the hidden button underneath) and SNAP! - Excellent leaf spring automatic action! Overall open length of this knife is 8" with a 3.5" .120 thick 154-CM Blade and a 4.5" handle that is .55" Thick. It weighs in at an average of 4.2 ounces. This is one awesome knife!