Lasts up to 5 times longer than standard sandpaper - sometimes there is no alternative to hand sanding. The problem was that conventional sanding sheets quickly became worn when grinding curves and edges. Often they were also shut up or broke. The only solution was to buy many abrasive sheets, was to produce high consumption and a lot of waste. Today, there are grinding foams with Bosch Surface Structure. The Bosch Surface Structure combines advanced techniques for joining and surface coating to best secure the grain to the surface. It is so strong that the Bosch Expert Grinding Foam Standard block does not lose any grain when grinding around edges and corners. In addition, the clogging of the abrasive sponge is minimized, as dust can be easily knocked out or washed off. There are also forms for even pressure on the surface. Square grinding sponges are ideal for grinding flat surfaces and 90 degree edges. The Bosch Expert Grinding Foam Standard block is a revolution in hand grinding. O