WORKPRO Folding Utility Knife Quick Change Blade, Al Die-Casting Handle Liner Lock, 10-piece Extra Blades Included Die-casting aluminum head with silver coating has the cover of stainless steel with grit blasting for durability and longevity Forged and anodized aluminum handle, ergonomic comfort grip design for lightweight and saving labor Quick-change blade mechanism for changing blades easily to meet the needs of different projects (press the button, which is made of zinc alloy to removal the blade and change it) Folding liner lock design for safety and convenient application. Please Check and Observe Local Laws and Regulations Before Purchase of this Item Accepts standard size utility blade, 10 more SK5 utility knife blades included Quick-change blade mechanism for changing blades easily to meet the needs of different projects,and the button, which is made of zinc alloy The press button is equipped with change-spring, which is made of  65Mn, solid to press for a long time Steps: Just press the button, and release, remove the blade and change, then insert the new blade, finally release the button Folding liner lock design allows for safety and convenient application, locking the blade in place when fully opening or closing it. It&#039;s convenient to fold the knife in one hand. Protects the blade and your fingers from any injury by accident It&#039;s easy to hold and carry with the stainless steel belt clip. You can take it in pocket,in bag or by hanging in the belt.