The Starrett KA19 Hole Enlargement Arbor allows diameters to be enlarged by attaching a saw of the same size to that of the existing hole. This saw then acts as the pilot for the larger diameter saw attached to the arbour. Specifications: Compatible Holesaws: FCH, DCH, TCT Multi Purpose, CT & Diamond. Compatible Threads: 1/2in x 20 & 5/8in x 18. Min. Hole Enlargement: 4.7mm (3/16in). https://elecena.pl/product/27181018/starrett-ay228-ka19-hole-enlargement-arbor 2024-11-08 https://elecena.pl/product/27181018/starrett-ay228-ka19-hole-enlargement-arbor 2026-05-17