Models
| Cat. No. | Type | Dia (mm) | F.L. (mm) |
| SL712 | Double Convex | 50 | 50 |
| SL713 | Double Convex | 50 | 60 |
| SL714 | Double Convex | 50 | 100 |
| SL715 | Double Convex | 50 | 150 |
| SL716 | Double Convex | 50 | 200 |
| SL717 | Double Convex | 50 | 250 |
| SL718 | Double Convex | 50 | 300 |
| SL719 | Double Convex | 50 | 400 |
| SL720 | Double Convex | 50 | 500 |
| SL721 | Double Convex | 50 | 1000 |
| SL722 | Double Concave | 50 | 50 |
| SL723 | Double Concave | 50 | 60 |
| SL724 | Double Concave | 50 | 100 |
| SL725 | Double Concave | 50 | 150 |
| SL726 | Double Concave | 50 | 200 |
| SL727 | Double Concave | 50 | 250 |
| SL728 | Double Concave | 50 | 300 |
| SL729 | Double Concave | 50 | 400 |
| SL730 | Double Concave | 50 | 500 |
| SL731 | Double Concave | 50 | 1000 |
| SL732 | Double Concave | 50 | 75 |
