The FISCH Wave Forstner and Premium plug sets are so accurate they produce a hole and plug with an interference fit. Including one premium FISCH plug cutter and one FISCH Wave Forstner bit. Available in 15, 20, 25 and 30mm diameter sets, with 13mm shank plug cutter and a 8mm shank forstner. There is also a 35mm diamter set with a 16mm shank plug cutter and a 10mm shank forstner. Made in Austria.