HSS & Cobalt Chatterless Countersink Sets

• Use with portable drills and drill presses on ferrous and non-ferrous materials
• Complete with wooden storage block

HSS – High Speed Steel

• Provides good wear resistance in mild steel and nonferrous materials

HSS – High Speed Steel Part Number Degree Number of Pieces Size Range 70-757-0 60 8 1/4, 5/16, 3/8, 1/2, 5/8, 3/4, 7/8, 1″ 70-760-4 82 8 70-763-8 90 8 70-758-8 60 10 1/4, 5/16, 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1-1/4, 1-1/2″ 70-761-2 82 10 70-764-6 90 10 70-759-6 60 10 3/16, 1/4, 5/16, 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1-1/4″ 70-762-0 82 10 70-765-3 90 10

M-42 Cobalt

• Provides better wear resistance in harness and toughness compared to HSS.
• Use in high-tensile alloys, titanium, cast iron, Inconel and high nickel stainless steel.

M-42 Cobalt Part Number Degree Number of Pieces Size Range 70-766-1 60 8 1/4, 5/16, 3/8, 1/2, 5/8, 3/4, 7/8, 1″ 70-768-7 82 8 70-770-3 90 8 70-767-9 60 10 3/16, 1/4, 5/16, 3/8, 1/2, 5/8, 3/4, 7/8, 1, 1-1/4″ 70-769-5 82 10 70-771-1 90 10