The Stanley 10-778 FatMax® retractable knife comes with 5 FatMax blades and has an instant blade change mechanism. There is a blade clamp for heavy-duty applications and a push button blade door release for quick and easy blade change.An auto rise blade storage holder presents a single blade for changing and there is a blade wiper to remove debris from the blade.The thumb pad and ergonomic cutting angle make it comfortable to use and ideal for flooring applications.