Shank Material: High Speed Steel. Shank: 1/4"(6.35mm). 6mm-100mm Diamond Hole Saw Cutter Drill Bit Set for Tile Glass Ceramic Marble. Radius: 1/8 5/32 3/16 1/4 5/16 3/8 7/16 1/2 9/16. High Speed Steel Body.
eBay