BK7 WINDOWS Specification MATERIAL: SCHOTT N-BK7 DIMENSION: + .00/ -.20mm THICKNESS: +/- 0.10mm EDGES: Fine Ground FLATNESS: ≤ 5 Fringes PARALLELISM: ≤ 3 Arc Mins Data Sheet: Custom:

Part No. Description Dimensions (mm) Thickness (mm) Unit Price (1-9) Qty (1-9) Qty (10+) WBK-251 BK7 Window Ø 25 1 £10.00 1 2 3 4 5 6 7 8 9       WBK-252 BK7 Window Ø 25 2 £11.00 1 2 3 4 5 6 7 8 9       WBK-253 BK7 Window Ø 25 3 £12.00 1 2 3 4 5 6 7 8 9       WBK-503 BK7 Window Ø 50 3 £26.00 1 2 3 4 5 6 7 8 9