291 Series - Dimcogray 4-prong pronged knob
| Part N° | Material | Unit system | Fastening gender | A | B | C | D | Thread length | Thread size |
| 2-291-300 | Phenolic | Imperial | Female | 1-1/4 | 7/8 | 5/8 | 3/8 | 7/16 | 1/4-20 |
| 2-291-301 | Phenolic | Imperial | Male | 1-1/4 | 7/8 | 5/8 | 3/8 | 1 | 1/4-20 |
| 2-291-302 | Phenolic | Imperial | Male | 1-1/4 | 7/8 | 5/8 | 3/8 | 1 | 5/16-18 |
| 2-291-303 | Phenolic | Imperial | Female | 1-1/4 | 7/8 | 5/8 | 3/8 | 7/16 | 5/16-18 |
| 2-291-304 | Phenolic | Imperial | Male | 1-1/4 | 7/8 | 5/8 | 3/8 | 3/4 | 1/4-20 |
| 2-291-305 | Phenolic | Imperial | Female | 1-1/4 | 7/8 | 5/8 | 3/8 | 5/16 | 10-32 |
| 2-291-308 | Phenolic | Imperial | Female | 1-1/4 | 7/8 | 5/8 | 3/8 | 7/16 | 10-24 |
| 2-291-311 | Phenolic | Imperial | Male | 1-1/4 | 7/8 | 5/8 | 3/8 | 3/4 | 10-24 |
| 2-291-312 | Phenolic | Imperial | Male | 1-1/4 | 7/8 | 5/8 | 3/8 | 3/4 | 10-32 |
| 2-291-313 | Phenolic | Imperial | Female | 1-1/4 | 7/8 | 5/8 | 3/8 | 5/16 | 10-24 |
| 2-291-314 | Phenolic | Imperial | Female | 1-1/4 | 7/8 | 5/8 | 3/8 | 7/16 | 1/4-28 |
| 2-291-317 | Phenolic | Imperial | Female | 1-1/4 | 7/8 | 5/8 | 3/8 | 1/2 | 3/8-16 |
| 2-291-326 | Phenolic | Imperial | Male | 1-1/4 | 7/8 | 5/8 | 3/8 | 3/4 | 5/16-18 |
| 2-291-336 | Phenolic | Imperial | Male | 1-1/4 | 7/8 | 5/8 | 3/8 | 5/8 | 5/16-18 |
| 2-291-344 | Phenolic | Imperial | Male | 1-1/4 | 7/8 | 5/8 | 3/8 | 2-1/4 | 5/16-18 |
| 2-291-345 | Phenolic | Imperial | Male | 1-1/4 | 7/8 | 5/8 | 3/8 | 1/2 | 10-32 |
| 2-291-347 | Phenolic | Imperial | Male | 1-1/4 | 7/8 | 5/8 | 3/8 | 1-1/2 | 1/4-20 |
| 2-291-348 | Phenolic | Imperial | Female | 1-1/4 | 7/8 | 5/8 | 3/8 | 7/16 | 3/16 |
| 2-291-349 | Phenolic | Imperial | Male | 1-1/4 | 7/8 | 5/8 | 3/8 | 1-1/2 | 5/16-18 |
| 2-291-353 | Phenolic | Imperial | Male | 1-1/4 | 7/8 | 5/8 | 3/8 | .4 | 5/16-24 |
| 2-291-357 | Phenolic | Imperial | Male | 1-1/4 | 7/8 | 5/8 | 3/8 | 1-1/4 | 5/16-24 |
| 2-291-358 | Phenolic | Imperial | Female | 1-1/4 | 7/8 | 5/8 | 3/8 | 437 | 1/4-20 |