25 pc #1 Square Robertson 2 Inch (50mm) Screwdriver Insert Bits Made of S2 steel for maximum durability. Bits are impact ready. Suitable for both hand tool and electric tool Bits come in heavy duty storage container. | Bits are 2 inches long. US-BASED CUSTOMER SERVICE: Available by chat, email, phone, or visit us at our customer service center in La Crosse, WI.