HomeMachine KnivesCalender Knives (Circular) MK36050 Calender Knife 3″ dia. (76.20 mm) 1/8″ thick (3.18 mm) Center hole dia. is 3/8″ (9.53 mm) Six indexing holes are 5/32″ dia. (3.97 mm) and form a 1″ dia. (25.40 mm) circle Semi-high speed tool steel with a 30° double bevel edge Package Qty 12 Weight (lbs) 0.225 Weight (kg) 0.102