Since all Snell SA-2015 helmets now have 6mm threaded inserts to mount a HANS/HNR device, RaceQuip offers this two pack of replacement 6mm threaded plastic insert plugs to fill the holes if you dont use a HANS/HNR. Two of these black plugs come standard with all RaceQuip SA-2015 helmets but these should also fit any other brand helmet that features the 6mm threaded insert. If you do not run a HANS/HNR device, it is best to keep the mounting holes sealed using these plugs. Also included in this kit are two plastic faceshield washers and a helmet instruction sheet and decals. This is the same parts and instruction kit that comes standard with every RaceQuip SA-2015 helmet.