Reece's UFL 2 Universal Lockout Device for Fuse Holders will lockout most types of Fuse Holders, and is a one-size-fits-all approach to Fuse Lockout. This device will lock out fuse holders between 20 Amp and 400 Amp, with a max clamping of 1/4". This device is made from sturdy Nylon plastic for increased durability, and is easily operated by using a screwdriver.