Hole saw size:

3/4"(19mm),7/8"(22mm),1"(25mm),1-1/4"(32mm),1-3/8"(35mm),1-1/2"(38mm),1-3/4"(44mm),

2"(51mm),2-1/4"(57mm),2-1/2"(64mm),3"(76mm),

arbor 3/8 hex shank,3/8 chuck,1/2-20 UNF,

        7/16hex shank,1/2 chuck,5/8-8UNF,

Plug is automatically ejected from saw

2" extension shank,10"(250mm)or extension shank,5-1/2"(140mm),or extension

                                shank 12"(300mm),extension shank,18"(450mm)