The GlossFire flat polishing discs are designed for polishing straight edges - they can be used with any in-line flat (straight) edge polishing machine using a snail lock attachment, such as machines manufactured by Marmo Meccanica, Sasso Meccanica (Flying Flat, Flat 62, Flat 8.4, Flat 10.4), Park Industries (Fastback), Montresor (Lola) and others.