This set from Heller includes 7 Forstner bits ideal for cutting flat-bottomed holes in any kind of wood or timber product. * Toothed rim and two major cutting edges guarantee exact drilling even near edges * Precision-ground centre point for exact starting * DIN standard: DIN 7483g Set includes the following diameter bits: 10mm, 15mm, 20mm, 22mm, 25mm, 30mm, 35mm.