16" 33Sl Pro-Guard Premium C-Loop Chain. This .325" pitch chain with 66 drive links is designed for both professional and casual users. Features Low-Vibration, Micro Chisel cutters with small radius working corners for excellent performance and easy maintenance. The chain helps the chain travel smoothly from cutter to cutter, fills the gap between cutters, and shields the depth gauge, requiring minimal added feed force for good performance. It meets ANSI standards and is UL classified. It fits Echo, Husqvarna, and Poulan chain saws.