Kuuma 3.75" Spring Assisted Knife has a fine edge, is 2.5mm thick and is made of 3Cr13 stainless steel. The durable handle is constructed of black reinforced nylon and the stainless steel clip and blade won't rust or corrode. Liner lock keeps blade in open position while in use. Dimensions: Closed = 3-3/4" Open = 6-5/8" Blade = 2-7/8