CRL Universal Muntin End Clips provide air space specific centering for your internal muntin framework. These clips are fabricated from tough nylon resin with flexible fingers that will grip any muntin from 1/2" to 3/4" (12 to 19 mm). Centering pins on the base pad prevent twisting of the muntin while long thin neck will bend to hold any diamond pattern firmly in place. The base pads are slightly smaller than the stated airspace dimension so there is never any worry of the clip interfering with the compression and sealing of your insulating glass units. Available in six popular air space dimensions, the UMC clips are gray in color for use with Super Spacer or regular aluminum spacer systems.