G.R.I. N20Rs-T-W Mni 3/8Trmnl W/Rare Eth Mag WG.R.I.s Mighty Mag contacts will assist in resolving the installers problem of drilling into the new thinner vinyl windows. These rare earth magnets are less than 1/ 8 high and install fast and easily without worry about damage to the window itself. Also known as -G.R.I. Telemark Corp. 3/ 8 D PRS FIT TE..