Aminatech hole saws are made to meet every need: carbon steel hole saws for cutting wood, plastic and composite materials. It has variety of accessories and components. Features: 1.For drilling wood, composition and plastic 2.Hardened and tempered alloy steel for long life 3.Precision sharpened teeth for smooth cuts 4.Fits all standard mandrels 5.Use for general common hand electric drill Specifications: Size(s)： 5 hole saw 2-1/2"(64mm), 3"(76mm), 3-1/2"(89mm), 4"(102mm), 5"(127mm) Accessories Included：1 hole saw arbo, 1 hex key wrench, 1 drive plate