Comparison : Item # 8068-02, Tissue Grinder, Micro Dual Purpose, All-Glass, 0.3mL Working Capacity, Size 17, 13-425 GPI Thread
Item # 8068-04, Tissue Grinder, Micro Dual Purpose, All-Glass, 1mL Working Capacity, Size 19, 13-425 GPI Thread
Item # 8068-06, Tissue Grinder, Micro Dual Purpose, All-Glass, 3mL Working Capacity, Size 20, 20-400 GPI Thread
Item # 8068-08, Tissue Grinder, Micro Dual Purpose, All-Glass, 5mL Working Capacity, Size 21, 20-400 GPI Thread