BD AutoShield Duo, a 5 mm safety-engineered pen needle from Becton Dickinson, is designed to protect health care workers and patients from needle stick injuries and exposure both during and after use. The needle can be used with a one handed, no pinch-up injection technique, minimizing the possibility of a skin fold-through needle stick. Research proves 5 mm pen needles enter subcutaneous tissue with minimal risk of intramuscular injection, and no additional leakage. Safety mechanisms activate automatically, virtually eliminating exposure risk to contaminated needles. BD AutoShield Duo fits all pens on the market.