BK-7, GR A, 76.2mm Ø X 12.7mm TK
Material: BK-7, Grade A
Diameter: 76.2mm +0.00/-.1mm
Thickness: 12.7mm ±.5mm
Plano/Plano Substrate
Specs both sides:
-Surface Quality: 40/20
-Flatness: 1/4 wave
-C.A. = 80%
All edges and bevels commerial polish
Wedge: 2 minute