Their flexibility enables them to adapt perfectly to the contours of the workpiece. On mounted flap wheels, coated abrasive flaps are arranged radially around the wheel axis in a fan-type structure.
;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.4" x 2" POLINOX® Non-Woven Finishing Drum - 5/8-11 Thread, PNG, A/O 180 Grit This flap structure facilitates improved stock removal and achieves a coarser surface finish. The non-woven abrasive material is arranged in multiple radial flaps, with abrasive cloth interlayers. The wide range of hardness grades and different configurations allow a variety of surface structures and roughness levels to be achieved.