The Silver-Line SL-8 is the leader in rental sanders for one reason . . . it works!  The DIYer can achieve professional results on their own at a fraction of the cost, it is the only machine on the market that will allow the DIY customer to achieve the results they want and expect. The 1 hp constant speed motor and soft rubber drum with our unique cam locking system combine to work like a professional sander. The sandpaper is held between 2 spring-loaded cams. The slow (1800 RPM) constant speed of the drum will not gouge floors.  When you sand forward and backward with the SL-8, you can be assured of straight sanding because it runs on the drum and wheels. The weight of the machine is specifically designed and evenly distributed for the best results.