Lezyne Tubeless Insert Bar-End Mount Tubeless Plug Tool Black. The Lezyne Tubeless Insert Kit is a stealth-mounted tubeless tire repair kit that discretely and securely inserts into the opening of a bicycle handlebar. Its constructed from lightweight durable machined aluminum and features a hardened stainless-steel reamer. The kit is easily accessible for quick tire repairs and comes with five high quality tubeless plugs that can also be stored inside its body. It also doubles as a bar-end plug and comes with three differently sized O-ring fasteners to ensure a secure fit inside most handlebar openings