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Prime-Line B 512
Consists of 1/4 in W center groove wheel. Heat-treated, high-tension adjustable steel M-spring. Used by several patio door manufacturers.
| Number of Rollers | : | 2 |
| Bearing Type | : | Ball |
| Spring Type | : | M |
| Roller Edge Type | : | Concave |
| Roller Width | : | 1/4 in |
| Roller Diameter | : | 1 in |
| Material | : | Steel |
| Color | : | Gray |
| Finish | : | Unfinished |
| Suitable for | : | Sliding Screen Glass Doors |
| Includes | : | (2) #8 x 1 in Phillips Screws |
- Heat-treated high-tension steel spring