Shank Material: High Speed Steel. Shank: 1/4"(6.35mm). Radius: 1/8 5/32 3/16 1/4 5/16 3/8 7/16 1/2 9/16. 3pcs 54.8mm HSS Wood Circular Saw Mini Disc Blades Drill Tool Set with Mandrel. High Speed Steel Body.
eBay