Rotary cutter bolt kit, includes keyed bolt, lock washer & nut. Thread size 1-1/8 inch-12, Overall length 3 inch, Thread length 1-5/16 inch, Shank length thru carrier .56 inch (9/16 inch), Blade mount length .55 inch (9/16 inch), Head thickness 1/2 inch, Head diameter 2-1/2 inch, Blade mount diameter 1.492 inch (for 1-1/2 inch blade hole), Bolt shank diameter 1.122 inch.