Here is a list of things you should really have in a toolbox. Having everything you need will save you a lot of heart ache and will make your work easier.
Hammer with a claw for removing nails
A screwdriver that will allow you to change heads
Tape measure
A level
Good quality electric drill
Working Gloves
Face mask for filtering out dust
Protective goggles
Torch
Pliers
Electrical tape. Preferably in different colours
Small hacksaw
Adjustable spanner
Various nails and screws with wall plugs
Pencil
