Laboratory Grade - AA
| Size | Four Ledge Part # | Four Ledge Price |
| 8x12 | M0812-4AA | $153.00 |
| 12x12 | M1212-4AA | $192.00 |
| 12x18 | M1218-4AA | $240.00 |
| 18x18 | M1818-4AA | $392.00 |
| 18x24 | M1824-4AA | $481.00 |
| 24x24 | M2424-4AA | $645.00 |
| 24x36 | M2436-4AA | $941.00 |
| 24x48 | M2448-4AA | $1392.00 |
| 36x48 | M3648-4AA | $1942.00 |
| 36x60 | M3660-4AA | $2408.00 |
| 36x72 | M3672-4AA | $2994.00 |
| 48x60 | M4860-4AA | $3118.00 |
| 48x72 | M4872-4AA | $3506.00 |
| 48x96 | M4896-4AA | Call |
Inspection Grade - A
| Size | Four Ledge Part # | Four Ledge Price |
| 8x12 | M0812-4A | $138.00 |
| 12x12 | M1212-4A | $163.00 |
| 12x18 | M1218-4A | $212.00 |
| 18x18 | M1818-4A | $329.00 |
| 18x24 | M1824-4A | $397.00 |
| 24x24 | M2424-4A | $545.00 |
| 24x36 | M2436-4A | $692.00 |
| 24x48 | M2448-4A | $1074.00 |
| 36x48 | M3648-4A | $1491.00 |
| 36x60 | M3660-4A | $1958.00 |
| 36x72 | M3672-4A | $2597.00 |
| 48x60 | M4860-4A | $2738.00 |
| 48x72 | M4872-4A | $3005.00 |
| 48x96 | M4896-4A | Call |
Tool Room Grade - B
| Size | Four Ledge Part # | Four Ledge Price |
| 8x12 | M0812-4B | $112.00 |
| 12x12 | M1212-4B | $130.00 |
| 12x18 | M1218-4B | $183.00 |
| 18x18 | M1818-4B | $270.00 |
| 18x24 | M1824-4B | $281.00 |
| 24x24 | M2424-4B | $438.00 |
| 24x36 | M2436-4B | $602.00 |
| 24x48 | M2448-4B | $961.00 |
| 36x48 | M3648-4B | $1262.00 |
| 36x60 | M3660-4B | $1585.00 |
| 36x72 | M3672-4B | $2109.00 |
| 48x60 | M4860-4B | $2188.00 |
| 48x72 | M4872-4B | $2608.00 |
| 48x96 | M4896-4B | Call |
Larger sizes available upon request
