Hilti CP 777 Speed Plugs are 60% faster than castle cutting and 43% faster than conventional mineral wool installations, according to the company. The speed plugs are preformed compressed insulation and designed to fit securely on top of wall decking. They come in 2" x 4/5" x 5.5" x 36" and 3" x 5" x 7" x 36" sizes.Hilti.