How can i add and remove tools by touching a block?

I am making a mini-game game and i want to add and remove when they spawn (just making an invisible part

To remove tools put this script inside of the part.

function hit(part)
    if hit == nil then return end
    h = game.Players:GetPlayerFromCharacter(part.Parent)
    if h ~= nil then
        c = h.Backpack:GetChildren()
        for i=1,#c do
            c[i]:remove()
        end
    end
end

script.Parent.Touched:connect(hit)

If you'd like to add tools on touch use a free model. There's one named create your own giver.