This is our third one inch coil machine. It's a power house like the other one inch designs. I have worked many years to perfect the one inch coil on Infinite Irons one inch coil machines. The coils run strong and cool. The Saros is a cool looking prefab steel machine with the rear binding post on the bottom of the frame. I believe all one inch machines should use this design so the clip cord can easily fit int the frame. The engraving is a combination of the crown of Isis which is made up of the horns and the Eclipsed sun, a disk in a disk. Inside of the disk is the mark of the cobra. The Saros is the path of the full solar eclipse on the earth. The crown of Isis is made up of the cobra making the disk of the sun, this is why the mark of the cobra is engraved in the center. CLICK ENLARGE TO SEE THE SHADER. Remember: You can pick PINCH VISE or TUBE SLEEVE and leave notes on coil cover color or image in the additional notes section. If you want to order back up springs, pick our B Front Spring for liners, and our E Front Spring for shaders. Liner Rear Spring for liners and Shader Rear Spring for shaders.