The sanding pad for different machines. The ST-STF D 150/17 MJ 5/16" sanding pad is for external machines such as Desoutter, Hamach/Rupes and Orka, and has a 5/16" connecting thread. The MULTI-JETSTREAM ensures a dust-free surface. For heavy-duty and universal use on external machines|Painting/varnishing work|Furniture manufacture. for Desoutter: Mod.575, Mod.576|for Hamach/Rupes: BR3/E/ST/E ST, TA151ST|for Orka: ROA1 D/E, DAA1 D/E|MULTI-JETSTREAM|burr layer. for external machines