258 Series - Dimcogray round fluted knob
| Part N° | Material | Unit system | Fastening gender | A | B | C | D | Thread length | Thread size |
| 1-258-002 | Phenolic | Imperial | Female | 3-1/4 | 1-25/32 | 2 | 7/8 | 5/8 | 1/2-13 |
| 1-258-006 | Phenolic | Imperial | Female | 3-1/4 | 1-25/32 | 2 | 7/8 | 5/8 | 1/2 |
| 1-258-008 | Phenolic | Imperial | Female | 3-1/4 | 1-25/32 | 2 | 7/8 | 1 | 7/16 |
| 1-258-019 | Phenolic | Imperial | Female | 3-1/4 | 1-25/32 | 2 | 7/8 | 1 | 3/4 |
| 1-258-024 | Phenolic | Imperial | Female | 3-1/4 | 1-25/32 | 2 | 7/8 | 1 | 5/8 |
| 1-258-030 | Phenolic | Imperial | Female | 3-1/4 | 1-25/32 | 2 | 7/8 | 1 | 3/8 |
| 1-258-035 | Phenolic | Imperial | Female | 3-1/4 | 1-25/32 | 2 | 7/8 | 1/2 | 3/8-16 |
| 1-258-043 | Phenolic | Imperial | Female | 3-1/4 | 1-25/32 | 2 | 7/8 | 3/4 | 5/8-18 |
| 1-258-075 | Phenolic | Imperial | Female | 3-1/4 | 1-25/32 | 2 | 7/8 | 5/8 | 1/2-20 |
| 1-258-091 | Phenolic | Imperial | Female | 3-1/4 | 1-25/32 | 2 | 7/8 | 5/8 | 5/8 |