Die-cast aluminium housing combines maximum strength with amazing lightweight properties Solid, secure handling. Extra-large handgrip & the diamond-shaped textured handle provides a sure grip whatever the conditions On-the-job efficiency. Holds up to 15 blades or a dispenser of 10 blades. Maximum flexibility. Chunky dial means that you can control the width of the knife opening, giving you a sure feel when using extra heavy-duty blades Fast blade change. Spring-loaded swivel opens the knife wide for quick & easy blade change. Plus the magnetic nose holds the blade in place whilst its been changed. Retractable blade.