5PCs HSS Drill Bit Hole Saw Set Stainless Steel Metal Alloy 16-30mm <br /><br />Specification:<br />Material:H.S.S<br />Outside Diameter:16mm/0.62''，18mm/0.71''，20mm/0.78''，25mm/0.98''，30mm/1.18''<br />Length:65mm/2.55''(Approx)<br />Diameter of Shank:9mm