How do I detect parts with tools?

I am going to make a dig tool for my game, but I need to know the name of the model I click on? How would I do this, and is there a simple method? Any help would be appreciated.

Use the mouse.Target method. It gives you the object that the mouse is pointed at.

For example:

local mouse = game.Players.LocalPlayer:GetMouse();
mouse.Button1Down:connect(function()
	print(mouse.Target); --Will print the target that you click on.
end