Manufacturer Series and Dimensions The manufacturer lists the Q9 ZR family as Titanium Series Flap Discs. This listing is for model Q9ZR-115-40, with a 115 mm diameter, 22.23 mm bore and grit 40. Technical Information Brand: Bering. Manufacturer model: Q9ZR-115-40. Series: Q9 ZR Titanium Series. Diameter: 115 mm. Bore: 22.23 mm. Grit: 40. Stock code: VHS1K3AQ. Product Selection Compare the disc diameter, bore and grit with the requirements of the tool and the intended surface finish.