Greenlee 38507 Round Shank with Three Flat Arbor for 9/16 to 1-3/16-Inch Hole Saws Air Tools They are 5/8-Inch in diameter

They are 5/8-Inch in diameter and have a breaking strength of 6

king pins etc

Keys made of heat treated Chrome Vanadium steel Quality set at an economical price S

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Greenlee 38507 Round Shank with Three Flat Arbor for 9/16 to 1-3/16-Inch Hole Saws Air Tools They are 5/8-Inch in diameterHigh speed steel (Pilot drill bit) material; 9 16 inch Min. Hole saw size; 1 3 16 inch Max. Hole saw size; 1 4 inch Shank size; Yes supplied with pilot Drill; round with 3 flat shank shape; chuck size 1 4 inch From the Manufacturer The best arbor in the industry ensures a solid connection without any gaps or wobbling. Arbors include replaceable high speed pilot drill. Pilot drills have unique split point tip design. Use with Greenlee bimetal hole