The Dormer C292 gold oxide-finished cobalt steel square end mill has a multi-flute design, a 30-degree helix angle, and a non-center-cutting design for general-purpose machining on a range of materials. The number of flutes varies; fewer flutes provide better chip-carrying capacity, while more flutes produce a finer finish. The gold oxide finish is a low-temperature heat treatment that reduces grinding stress within the tool. The cobalt steel substrate can be run at faster speeds and stays sharp longer than high-speed steel tools, while offering resistance to heat and abrasion. The tool€s square end creates sharp, unrounded cuts.

The 30-degree helix angle supports general-purpose machining applications. It balances lower angles€ strong cutting edge for difficult-to-machine materials with higher angles€ increased cutting action. The non-center-cutting design is for applications such as peripheral milling and finishing. This tool has a threaded shank for security when used with coordinating toolholders.

End mills are designed to remove material and create multi-dimensional shapes and profiles. They have cutting edges along the outside diameter and flutes that remove chips from the cutting area and allow cooling fluids to enter. If heat is not reduced effectively, the tool€s cutting edges will dull and additional material buildup can occur. The number of flutes can range from two to eight. Two-flute designs offer the most efficient chip removal, but more flutes provide a smoother finish. The shank is the end of the tool held in place by a tool holder or machine. Center-cutting end mills can create three-dimensional shapes and profiles, and make plunge cuts similar to a drill bit. Non-center-cutting end mills are for applications such as peripheral milling and finishing, but cannot make plunge cuts.

Precision Dormer manufactures cutting tools under the brands Precision Twist, Dormer, and Union Butterfield. The company has locations around the world, and makes tools that meet American National Standards Institute (ANSI), National Aerospace Standard (NAS), and Deutches Institut fr Normung (DIN) standards.