Featuring a clear indicator window that tells you when you"re running low on nails, the D51420K from DEWALT offers a user-friendly design for smooth performance. To alter drive depth, simply use the thumb wheel; to keep air, debris, and dust from interrupting your work, rely on the 360 degree exhaust channels--both of these handy perks require no tools. And trust the overmolded, no-mar pad to make it easier to see your workspace without causing any material damage, while textured, anti-slip grips ensure comfort and control. Finally, a convenient trigger lock lets you disable the trigger off when you"re not using the D51420K.