General purpose hole saw kit produced with Starrett's Fastcut bi-metal hole saws. These variable pi tch hole saws have been the industry standard for decades. Hardened, heat resistant, and positive r ake high speed steel teeth are welded to a durable alloy backing and cap. They are exceptionally st rong, safe, and shatter resistant. These tools effectively and economically cut a wide variety of m aterials including wood, metal, and steel. Kit includes nine bi-metal hole saws: 3/4'' (19mm), 7/8' (22mm), 1-1/8'' (29mm), 1-3/8'' (35mm), 1-1/2'' (38mm), 1-3/4'' (44mm), 2'' (51mm), 2-1/4'' (57mm) , 2-1/2'' (64mm); two arbors: A1, A2; one high speed pilot drill bit: A014C; one arbor adaptor: A12; one ejector spring: A7; and case.