4-1/4" CARBIDE TIPPED BY 1-7/8" Depth Hole Saw Bit Made In The USA. Blu-Mol You are buying on one (1) brand new, never used 4-1/4" CARBIDE TIPPED Hole Saw Bit. they are still in retail packaging. All these bits are great quality and we believe that you will be pleased with them. Any questions please feel free to email us or call us. You will need a 5/8" -- 18 thread arbor to fit this hole saw