Removable shaft adjusts within 4" to 8" (10-20 cm) range for numerous length combinations • Blades feature #2 Phillips and 1/4" Slotted tip for multiple screwdrivers in one tool • Proprietary system securely holds blade as durable as a traditional Klein fixed blade screwdriver • Press down to extend or lengthen the shaft • Push up to retract or shorten the shaft • Cushion-Grip handle for maximum comfort and torque • U.S. Pat. 6,561,523