Replacement 1/4" Arbor Adapter - This handy Large Diameter Replacement Arbor Adapter doubles your capabilities.Replacement 1/4" Arbor Adapter features include: Large Diameter Replacement Arbor Adapter Converts 1/2&ldquo:-20 Thread Size Arbor to 5/8&rdquo:-18 Thread Size for use with Larger-Diameter Saws Large Diameter Replacement Arbor Adapter Not Recommended For Saws Larger than 1-1/2&rdquo: Diameter Order Qty of 1 = 1 Piece Below is more info on our Replacement 1/4" Arbor Adapter