Is the screwdriver big enough to remove the neck of the guitar? Is it true that the tip of the screwdriver is made of plastic?

The screwdriver is big enough to remove the neck no problem. No, it's not made of plastic. It seems to be aluminum with a coated tip.

Does this fit rg7421xl truss rod? (should be 7mm, not sure though)

Hi, I ordered this for the same reason, to adjust my truss rod. I have a RG 2007 anniversary, it fits my truss rod perfectly, as I have the edge bridge whammy system( hard to get to adjust the truss rod with the string tree retainer) You can try http://ibanez.wikia.com/wiki/Ibanez_Wiki , they have a lot of info on the Ibanez guitars past and present... Hope this helps!!

Item Weight	0.14 Kilograms
Folded Size	4 inches (l) x 2 inches (w) x 1 inch (h)
Item Dimensions	3.71 x 1.26 x 1.46 inches
Drive System	Center Drive
Number of Pieces	11
Material Type	Alloy Steel
Color	Red

MTZ MTZ11 Quick Access Multi Tool, Red

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