Check the listing for details. Nitro N3100/G-Mac Roar Evo Pinlock 70 Motorcycle Visor Insert DKS202 Clear. Color: Clear, Condition: New. Listed at 70.89 USD. Nitro N3100 Pinlock anti-fog inserts clip between two adjustable eccentric pins located in your helmet visor, these inserts can be easily swapped over depending on your riding needs. The Nitro 3100 Pinlock insert is made of a moisture absorbing plastic and the silicone seal on the Pinlock insert ensures there is an insulating air layer between the Pinlock insert and the visor. Both these combinations make Pinlock the worlds number one anti-fog product. The Nitro N3100 Pinlock lenses are all supplied in the Pinlock 70 fog resistant level. The Pinlock 70 is a premium fog resistant solution for riders. Enhanced with strong fog resistant properties, the insert lens has extended fog resistant endurance which helps riders see better through challenging weather conditions. The Pinlock 70 is also.