An accessory holder for releasably storing tool implements on a portable hand power tool. The coil-embedded dust core comprises a coil formed from a flat conductor wound in a coil configuration, and a green body consisting of insulating material-coated ferromagnetic metal particles. Each of the top and bottom members has opposite terminal ends each formed as a connecting member having a vertical slot. 0 weight % with the outer and inner circumferential surfaces covered with nitrided layers. The process can be used for the providing of target triglycerides having a controlled fatty acid chain distribution. These different magnetic characteristics allow the pinning of magnetic domain walls at the boundaries between these layers.