This 13-in-1 ratcheting screwdriver set features a zinc alloy solid core ratchet that can deliver up to 225 lbs of torque strength. The ratchet design features 28 teeth that make using the driver fast and easy. This screwdriver has a cute patented design with a pull-out cartridge that can hold x 6 double-ended bits. Not only does this save time but it saves space too and keeps your bits close at hand when you most need them. The handle has been specially created with a tapered design to reduce fatigue and give you extra comfort.