Prentke Romich Company
http://www.prentrom.com/support/article/1762
| Device and Overlay | Key Sizes in Inches | |
| Vanguard 4 loc | 4.75 | 2.75 |
| Vanguard 8 loc | 2.5 | 2.75 |
| Vanguard 15 loc | 1.75 | 1.75 |
| Vanguard 45 loc | 1 | 1 |
| Vanguard 84 loc | 0.75 | 0.75 |
| Device and Overlay | Key Sizes in Inches | |
| Vantage 4 loc | 3.25 | 1.75 |
| Vantage 8 loc | 1.5 | 1.75 |
| Vantage 15 loc | 1.25 | 1.25 |
| Vantage 45 loc | .75 | .75 |
| Vantage 84 loc | 0.5 | 0.5 |
| Device and Overlay | Key Sizes in Inches | |
| SpringBoard Lite 4 loc | 3 | 1.25 |
| SpringBoard Lite 8 loc | 1.75 | 1.375 |
| SpringBoard Lite 15 loc | 1.25 | 0.875 |
| SpringBoard Lite 32 loc | .625 | .625 |
| Activity Row | .625 | .625 |
| Device and Overlay | Key Sizes in Inches | |
| SpringBoard 4 loc | 3 | 1.75 |
| SpringBoard 8 loc | 2 | 2 |
| SpringBoard 15 loc | 1.5 | 1.75 |
| SpringBoard 32 loc | .75 | .75 |
| Activity Row | .75 | .75 |
| Device and Overlay | Key Sizes in Inches | |
| Pathfinder 32 loc | 1.25 | 1.25 |
| Pathfinder 128 loc | .75 | .75 |
| Activity Row | 1 | 1 |
| Toolbox | .75 | .75 |
| Device and Overlay | Key Sizes in Inches | |
| Eco-14 4 loc | 5.75 | 3.25 |
| Eco-14 8 loc | 2.75 | 3.25 |
| Eco-14 15 loc | 2.25 | 2.25 |
| Eco-14 60 loc | 1.25 | 1 |
| Eco-14 84 loc | .87 | .87 |
| Eco-14 144 loc | .75 | .75 |
| Device and Overlay | Key Sizes in Inches | |
| Vantage Lite 4 loc | 3.25 | 1.75 |
| Vantage Lite 8 loc | 1.5 | 1.75 |
| Vantage Lite 15 loc | 1.25 | 1.25 |
| Vantage Lite 45 loc | .75 | .75 |
| Vantage Lite 60 loc | .625 | .625 |
| Vantage Lite 84 loc | .5 | .5 |