Comparison : Item # 8059-04, Tissue Grinder, Dual Purpose, All-Glass, Threaded, with Cap, 3mL Working Capacity, Size 21, 15-415 GPI Thread
Item # 8059-06, Tissue Grinder, Dual Purpose, All-Glass, Threaded, with Cap, 5mL Working Capacity, Size 22, 18-415 GPI Thread
Item # 8059-08, Tissue Grinder, Dual Purpose, All-Glass, Threaded, with Cap, 15mL Working Capacity, Size 23, 24-415 GPI Thread