Bit Design: These are PH2 (Phillips #2) double-ended cross screwdriver bits, which is the most widely used size for standard household, construction, and drywall screws.Magnetic Collar Rings: The orange sleeves at the tips are detachable magnetic depth-stop rings. They serve a dual purpose: they securely magnetize and grip screws to prevent them from dropping, and they act as a physical stop to prevent driving screws too deep into materials like drywall or soft wood.