.;The unmounted flap wheel is designed for working on medium-sized surfaces with variable-speed angle grinders and fillet weld grinders, and can be mounted directly onto the drive system’s spindle without the need for additional clamping devices. The wide range of hardness grades and different configurations allow a variety of surface structures and roughness levels to be achieved. The non-woven abrasive material is arranged in multiple radial flaps, with abrasive cloth interlayers.