Draper 1x 320mm 7/16" Hexagon Shaft Holesaw Arbor Extension Professional Tool. This tool is for use with Stock No.52983, 56387 and 56402 7/16" hexagonal shank Holesaw Arbors to extend the arbor. It comes in a display carton. Dimensions: 35.50cm x 4.90cm x 2.20cm Weight: 0.32kg