Bosch Hole Saws HSS-BiM Vario-tooth for Standard Arbors - Bosch 2608584852, Bosch HSS bi-metal holesaw for standard adaptors, 111mm, 4 3/8in.
Arbors are supplied separately.
Bosch 2608584852 Hole Saw HSS-BiM 111mm Vario-tooth for Standard Arbors