19/19 Downstem with Horizontal SlitsNote: Length of stem does not include joint length; sandblasted joint is 1 inch long.• Borosilicate glass • 6 Horizontal slits • Bong joint: 19mm • Slide joint: 19mm female • Available stem length: 3 inch | 3.5 inc | 4 inch | 4.5 inch | 5 inch STEM LENGTH measures from the beginning of the tube to the tip, excluding the joint section.This diffuser downstem has 6 horizontal slits with 19/19 fitting that is fully compatible with bongs, beakers, bubbler or straight tubes featuring 19mm joints. Various downstem lengths available.