This Kaiser 35mm Format Glassless Mask for the Kaiser compound negative carrier, is used in the System V enlargers. It is 24 x 36mm (35mm).
The mask has guide ridges for film strips and a negative number read-out window. It is about 3.9 x 2.9", (100 x 72.5mm).
The KAISER MASKS are exactly what I needed. B&H, as always, went above and beyond to get this item.
Purchased as replacement masks for my Kaiser System V enlarger that is over 30 years old. These masks are very hard to find today and those that you do find are mostly in Europe, where the prices and shipping charges are much higher. Kudos to B&H for making them available and, despite this being a special order item, it arrived in less than three weeks.