Heavy duty 'auto retract' version of the ReAkta utility knife with aluminium blade carrier and with either a carbon or ceramic blade. Blade will not lock in an 'out' position and will retract unless being used. Once you have punctured into the material, you may let go of the lever and the blade will stay out whilst cutting, once finished, the blade will automatically retract back in. The lock switch on the ReAkta allows the blade to be locked into the knife but if an attempt is made to lock the blade in the out position the blade will retract back into the knife. For the METAL DETECTABLE version of the ReAkta, click here