ProTechCiabatta knife for sale. The Pro-Tech Knives Automatic Ciabatta: Blackie Collins Design is made with a revolutionary Pin Lock Ultra Safety mechanism. The Ciabatta is a completely new idea in folding knives. The mechanism is "Spring Assisted" because the knife can only be opened with pressure applied to the blade, and there is a detent that keeps the blade in the closed position so that it cannot be flipped open with gravity. The Pin Lock Ultra Safety (PLUS) mechanism will take a few minutes to become familiar with. Since this knife opens and closes in a completely different manner than other knives, be sure to take some time to review the instruction shee before handling these knives. Overall open length is 7.76" with a blade length of 3.15" .110". Handle 4.61 Long .48" Thick. This great knife weighs in at 4.2 ounces. Once you've tried it, you'll love it!