L-18 Auto Lock comes with an automated locking slider and comes with 2 spare blades which are stored in the handle. It has an ergonomic handy design and also made in Japan. The L-19 Twist L comes with a screw lock which helps tighten the blade more securely and comes with 2 spare blades which are stored in the handle. It has an ergonomic handy design and also made in Japan.