♥ Make sure the drum have been screwed tightly, drum mandrels with self-expanding rubber cushion, making the sanding bands close to the manderl firmly and acheiving better finishing; ♥ Steel sand wool abrasive sleeve is more and wear-resisting. ♥ Suitable for polishing on metal, model, wood sculpture, root sculpture, . ♥ please wear professional glasses to protect your eyes, because maybe there are flying grits when the sanding drum turning at high speed ♥ Commonest and standard size drum sander set which are widely applied in smoothing and curved edges, polishing both soft and hard Component, like home improvement, artwork , woodworks and other finishing and working.