RyMarCool Sheet Metal Hand Seamers. Designed for the HVAC and Sheet Metal Industry. Rugged build and ergonomic designed to reduce fatigue in the field. 1.25-inch x 6-inch blade. The handles are strong and durable. The handle texture and design allow for precision use. The quality of the RyMarCool 6" Hand Seamers meets and exceeds the HVAC and Sheet Metal industry expectations.