Features and Benefits:The included pneumatic motor spins at 220 rpm and includes 6 different tap holders.Another nice feature of the ATM-27-1000 heavy duty industrial articulating arm is that is has an ergonomic design, this is to protect workers from injuries that tend to develop over time during repetitious work.Air tapping spindleWork range 3.93" to 39.3"Slanted armTable mount system1/4", 3/8", 1/2", 5/8", 3/4" and 7/8" tap holders includedTheATM-27-1000 pneumatic tapping armfrom Baileigh industrial is a heavy duty articulating tool support arm designed to provide fingertip control for the most demanding applications. The sturdy cast iron swing arm is connected to the base by means of a hardened and ground shaft that incorporates a leveling system. The twin parallel arms are made of heavy gauge aluminum tubing that is effective at neutralizing vibration and torque reaction.