Quartz Boat for Diffusion of 1" Wafer Processing (25/boat) - EQ-QB-1025 Quartz Boat for Diffusion of 2" Wafer Processing (25/boat) - EQ-QB-2025 Quartz Boat for Diffusion of 3" Wafer Processing (25 wafer/boat) - EQ-QB-3025 Quartz Boat for Diffusion of 4" Wafer Processing (25 wafer / boat) - EQ-QB-4025 Quartz Boat for Diffusion of 4"X 4" Square Wafer Processing (25 wafer / boat)..