AMK4133 Al Mar B-21 LinerlockThe AMK4133 B 21 is a mid sized linerlock folder built around a 3. 75" satin D2 blade with a modified clip point geometry, making it equally capable for utility cutting and controlled detail work. The black and blue G10 scales offer solid grip security and durability in wet conditions, while the thumb stud and pocket clip keep it accessible for one handed deployment and daily carry. D2 tool steel holds an excellent edge and resists corrosion better