An arbor for a hole cutter, said hole cutter including an outer surface defining a threaded hole, and at least one pin hole spaced radially relative to the threaded hole, the arbor comprising: a. an arbor body including a threaded end portion threadedly engageable with the threaded hole of the hole cutter, a stop surface formed adjacent to the threaded end portion and spaced radially outwardly there from, a drive shank located on another end portion of the arbor body, and a first bearing surface extending axially along a portion of the arbor body between the stop surface and drive shank; b. a pin support member including an aperture formed there through, a second bearing surface formed adjacent to the aperture, and a third bearing surface formed on one side of the pin support member, at least one pin extending outwardly of the third bearing surface, wherein the arbor body is receivable within the aperture of the pin support member with at least one of the pin support member and arbor body being axially movable relative to the other, at least one of the first and second bearing surfaces (36, 46) is engageable with the other for preventing relative rotation of the pin support member and arbor body, the at least one pin is receivable within the at least one pin hole of the hole cutter, and the third bearing surface of the pin support member is abuttingly engageable with the hole cutter with the at least one pin received within the at least one corresponding pin hole of the hole cutter; and c. a locking member coupled to the arbor body for releasably securing the pin support member to the hole saw, wherein at least one of the second and third bearing surfaces (42, 46) is movable axially over the stop surface of the arbor body, characterised in that at least one of the second and third bearing surfaces (42, 46) is engageable with a peripheral surface of the threaded end portion of the arbor body. a. an arbor body including a threaded end portion threadedly engageable with the threaded hole of the hole cutter, a stop surface formed adjacent to the threaded end portion and spaced radially outwardly there from, a drive shank located on another end portion of the arbor body, and a first bearing surface extending axially along a portion of the arbor body between the stop surface and drive shank; b. a pin support member including an aperture formed there through, a second bearing surface formed adjacent to the aperture, and a third bearing surface formed on one side of the pin support member, at least one pin extending outwardly of the third bearing surface, wherein the arbor body is receivable within the aperture of the pin support member with at least one of the pin support member and arbor body being axially movable relative to the other, at least one of the first and second bearing surfaces (36, 46) is engageable with the other for preventing relative rotation of the pin support member and arbor body, the at least one pin is receivable within the at least one pin hole of the hole cutter, and the third bearing surface of the pin support member is abuttingly engageable with the hole cutter with the at least one pin received within the at least one corresponding pin hole of the hole cutter; and c. a locking member coupled to the arbor body for releasably securing the pin support member to the hole saw, wherein at least one of the second and third bearing surfaces (42, 46) is movable axially over the stop surface of the arbor body, characterised in that at least one of the second and third bearing surfaces (42, 46) is engageable with a peripheral surface of the threaded end portion of the arbor body.