| STANDARD TYPE 274 (21/32 - 25/32) |  |
| STANDARD TYPE 275 (13/16 - 7/8) | |
| STANDARD TYPE 276 (15/16 - 1.1/16) | |
| STANDARD TYPE 289 (1.3/32 - 1.3/16) | |
| MONOBLOC 375 (21/32 - 7/8) |  |
| MONOBLOC 376 (15/16 - 1.1/16) | |
| MONOBLOC 389 (1.3/32 - 1.3/16) | |
| CONCENTRIC MK1 600 series (22 - 26 mm) |  |
| CONCENTRIC MK1 900 series (28 - 32 mm) | |
| CONCENTRIC MK2 series (upto 40 mm) |  |
| STAINLESS STEEL CONCENTRIC series |