Material: Stainless Steel
PENTAC188-------
| Screw Diameter | Square Width Max | Head Diameter |
| 1/4-20 | .280 | 31/32 |
| 5/16-18 | .342 | 1-3/16 |
| 3/8-16 | .405 | 1-5/16 |
| 1/2-13 | .530 | 1-9/16 |
Disclaimer: The dimensions listed are for reference only. Sizes not listed may be available off the shelf or can be manufactured to customer requirements.