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Northern Tool + Equipment [northerntool.com] has the 3-Piece Klutch Cobalt Step Drill Bit Set (3/16" to 3/4" Dia.) on sale for $ 15. Shipping is free, lower 48 states only.

Description:

• High-speed, heavy-duty steel with cobalt coating
• Professional quality
• 3/16–1/2" dia., 6-step bit
• 1/4–3/4" dia., 9-step bit
• 1/8–1/2" dia., 13-step bit