Mtech Spring Assisted Knife 3.25in 3CR13 Stainless Steel Sheepsfoot Steel Blade Aluminum Handle Red. The spring also helps when you find yourself in a tight spot since it releases the blade with just a small push of a button. It has a lightweight aluminum handle that gives the knife a very comfortable grip and features a pocket clip for easy carry. Since it uses a spring it also does not rust after a short while of use. Other features of this knife include bead blast CNC machining an anodized aluminum handle a liner locking mechanism and a stainless steel backspacer. Specifications for Mtech MT-A1131 3.25in Spring Assisted Knife: Manufacturer: Mtech Blade Length: 3.25 in Blade Material: 3Cr13 Serrated: Plain Overall Length: 7.75 in Handle Material: Aluminum Handle Length: 4.5 in Handle Color: Red Handle Finish: Anodized Blade Finish: Steel Blade Shape: Sheepsfoot Opening Method: Spring Assisted Additional Features: Clip Color: Red Package Contents: Mtech MT-A1131 3.25in Spring Assisted Knife Mtech MT-A1131RD: MT-A1131RD Spring Assisted Knife 3.25in 3CR13 Stainless Steel Sheepsfoot Steel Blade Aluminum Handle Red