Product details : BOSCH 2608584682 HOLESAW ADAPTOR NUT SET
Transition adapter set for standard hole saws from the competition (e.g. Starrett, Baco, Lenox etc.). 6-piece. With 2 adapters for diameter 14-30 mm (1/2 inch 20UNF thread). With 4 adapters for diameter 32-210 mm (5/8 inch 18UNF thread).