Features a radius of 0.53 to 0.79", and is for the concave surface of a sphere.
Features a radius of 0.53 to 0.79", and is for the concave surface of a sphere.
Support ring for convex surface of cylinder.
| Radius | 0.53 to 0.79" (13.5 to 20 mm) |
| Radius | 0.53 to 0.79" (13.5 to 20 mm) |
