Select an insulin syringe, 31 gauge 6 mm needle and inject insulin at a 45-degree angle.

Select a 0.5 mL syringe, 30 gauge, 8 mm needle and inject at a 90-degree angle.

Select a 0.5 mL syringe, 29 gauge 8 mm needle, pinch the skin, and inject at 45 degrees.

Select a 1.0 mL syringe, 28 gauge 12.7 mm needle, and inject at 90 degrees.