This GSTK carbide hole saw with a saw diameter of 20 comes with an Allen key and an extra spring, all packaged brand new. Ideal for use in metalworking, this product is sure to provide precise cuts and reliable performance. The carbide material ensures durability and longevity, while the included accessories make it easy to use straight out of the package. Suitable for use in a variety of applications, this hole saw is a must-have for any metalworking enthusiast or professional.