16pce Holesaw Set. 19, 22, 29, 32, 38, 44, 54, 64, 76, 89, 102 & 127mm. Arbours & chuck: 6.35mm (1/4") shank for use with 19mm to 29mm holesaw. 9.35mm (3/8") shank with 6mm HSS drill for use with 32mm to 127mm holesaw, reinforcing adaptor plate & hex key to fit arbors