Parlec C50-10TT3C Tapping Heads; Shank Type: Taper Shank; Shank Diameter (Inch): 1; Taper Size: CAT50; Minimum Tap Capacity (mm): M1.4; Minimum Tap Capacity (Inch): #0; Maximum Aluminum Tap Capacity (mm): M14; Maximum Aluminum Tap Capacity (Inch): 9/