How do you use the Region3 functon?

I'm trying to create my own stamper, and I need an Region3 argument for the area to stamp in. I'm stuck on this part. Anyone know to use Region3? Thanks.

Below is my custom stamper tool code.

local RbxStamper = LoadLibrary("RbxStamper")
local InsertService = game:GetService("InsertService")

local dispenser = game.workspace.Part
local player = game.Players.LocalPlayer
local mouse = player:GetMouse()

local regionModule = require(game.workspace.RegionModule)

local stampControl 
local pBase = nil

function findBase()
    for _, base in pairs(game.workspace["Building Zones"]:GetChildren()) do
        if base:IsA("Model") and base.Player.Value == player.Name then
            pBase = base            
        end
    end
end

function setupDragger()
    if pBase then
        local region = ???
        stampControl = RbxStamper.SetupStamperDragger(dispenser,mouse,nil,Region3.new( Vector3.new(1, 1, 1), Vector3.new(9, 9, 9) ))
    else
        warn("Cannot find your building base.")
    end
end

function stamp()
    setupDragger()

    stampControl.Stamped.Changed:connect(function(value)
        stampControl.ReloadModel()
    end)
end

script.Parent.Equipped:connect(function()
    if not pBase then
        findBase()
    end
    stamp()
end)

script.Parent.Unequipped:connect(function()
    if stampControl then stampControl.Destroy() pBase = nil end
end)