The 660 Fixed Head Gripnailer brings reliability to a new level. This machine has been evolving for the part 4 decades and the newest model 660 has taken all the best features from its predecessors. Critical components are sealed and not affected by dirt, airborne particles, temperature or humidity. A PLC (Programmable Logic Control) unit coordinates all machine functions. This is by far the simplest and most reliable mechanical fastening machine ever built!