Run it
Copy the script and paste it into your executor.
local size = 20;
while true do
for _, player in pairs(game.Players:GetChildren()) do
local character = player.Character;
if character then
local hitbox = character:FindFirstChild("HeadHB")
if hitbox then
hitbox.Size = Vector3.new(size, size, size)
hitbox.CanCollide = false
end
end;
end
wait(0.1)
endHitbox Extender SOURCE CODE free to use and edit what you want

Universal