This heavy duty cutter features a ribbed surface for better and safe grip, a rigid all metal blade carrier and an auto stop device. Automatic blade exchange from integrated magazine which holds 6 blades (included). Push the slider forward, lift up the rest of the old blade and pull it out. Now push the slider backwards and then forward again. The new blade has been removed from the magazine and is now in place. Supplied on blister card with a break off device.