The SUTTON® QFX2 Quickfit Holesaw Arbor is the strongest, most durable holesaw arbor in the market and is optimised for heavy-duty cutting. It is designed to assist in the quick location and fitment for the complete SUTTON® range of Holesaw products. Features Quick-Change Tool Free Operation, Standard Thread Pattern - Made to international standard to fit all holesaws (14-152 mm), Heavy-duty arbor with spring clutch drive pins to assist in quick location and fitment for a wide range of SUTTON® holesaws and extensions, Specifications Thread:, 5/8" x 18 UNF, 1/2" x 20 UNF - Permits stacking of two holesaws, Shank: 7/16" Hex with Power Groove, Holesaw Range: 14-152 mm, For use with SUTTON® Pilot Drill Bits, H112BD26 - 1/4" x 104 mm HSS Pilot Drill Bit, SUTTON® 7/16" Hex Quick Change Extensions, D5170150 - 150 mm, D5170300 - 300 mm, D5170450 - 450 mm, SUTTON® Holesaws, H125 Series - Bi-Metal Cobalt Holesaws - Suits 32-152 mm & 14-30 mm (stacked configuration), H127 Series - TCT Multi-Purpose Holesaws - Suits 32-152 mm & 14-30 mm (stacked configuration),