The Extension Adapter Pack contains a variety of extension adapters, which allow the use of Bosch's power-change systems in holesaws made by such competitors as Starrett, Baco and Lenox. This pack contains two adapters for diameter 14-30 mm (1/2-inch-20UNF thread), and four adapters for diameter 32-210 mm (5/8-inch-18UNF thread). Bosch 2608584682 6-Piece Transition Adapter Set Colour: black Content: 6 pcs Extension adapter set for standard hole saws Bosch 2608584682 With 2 adapters for diameter 14-30 mm (1/2'-20UNF thread), 4 adapters for diameter 32-210 mm (5/8'-18UNF thread) Adapter for compeors’ holesaws, such as Starrett, Baco and Lenox, among others Content: 6 pcs, Weight: 0.41446905256 Pounds, Manufacturer: Bosch