This Pinlock is only suitable for the following visors: KD-18 for EXO-TECH. A Pinlock is a lens that is attached to the inside of the visor to prevent fogging of the visor. The Pinlock lens is made of a special moisture-absorbing plastic. The silicone seal on the Pinlock lens creates an insulating layer of air between the Pinlock lens and the visor just like double glazing.