16-Piece Standard Set includes guide plus 1 In. drive bits. Self-retracting guide sleeve protects fingers and holds screws in place while eliminating wobbling and slipping. Standard Set accessories come with ToughCase+ system. The ToughCase+ system is a connectable case system designed to optimize storage space and keep bits organized. The bit-bar design allows for easy bit removal and the clear lid allows you for easy viewing. Clip latch for secure closing.