Mtech Spring Assisted Knife 3.75in 3CR13 Stainless Steel Straight Back Mirror Blade Stainless Steel Handle Mirror. The flipper opens by pushing the spring release button situated on the handle. Once the blade deploys the spring lowers and opens the blade while the user is applying pressure to the spring bar. Once the blade is open the user applies pressure to the spring bar to deploy the knife. The camouflage color makes this knife great for concealing in plain sight and easy to find in your pocket or bag. This model features a 3.75 inch stainless steel blade and is equipped with a stainless steel frame. Other features include a stainless steel pocket clip dual sided thumb studs and a three position pocket clip. Specifications for Mtech MT-A1173 3.75in Spring Assisted Knife: Manufacturer: Mtech Blade Length: 3.75 in Blade Material: 3Cr13 Serrated: Plain Overall Length: 8.5 in Handle Material: Stainless Steel Handle Length: 4.75 in Handle Color: Stainless Steel Blade Shape: Normal Opening Method: Spring Assisted Additional Features: Clip Package Contents: Mtech MT-A1173 3.75in Spring Assisted Knife Mtech MT-A1173MR: MT-A1173MR Spring Assisted Knife 3.75in 3CR13 Stainless Steel Straight Back Mirror Blade Stainless Steel Handle Mirror