The OLFA® SK-4 is made with safety in mind. With the help of a powerful return spring, the blade goes straight back into its body and out of harms way automatically, as soon as you let go of the slider. Deep grooves on the body add grip to an ergonomically shaped tool. The body is made from durable ABS plastic, and the blade channel and spring are made from stainless steel so they will remain rust-free forever. Accommodates both right and left handed users. Pre-loaded with an ENDURANCE™ trapezoid blade.