This Drop Down Adapter is 4" in length, and is perfect if you're looking to change both the joint location and its size to use with your rig or bong. Use this clear glass Z-Shape converter with a 1.5" drop turn your 10mm Male Joint rig to offer an 10mm Female Joint. This way, you'll be able to use any 10mm Male Joint Nail or Bowl with your glass piece! We have all joint size conversions to fit any bong and accessory together. The drop down aspect allows you to bring the joint in which you place the nail or bowl itself further away from the body of the piece. This is especially nice if the joint on your pipe is located too close to your face for your liking, or is located at at close quarters that makes it difficult to use your rig. This converter is definitely is a great adapter to have to make your dabbing a more seamless, much easier experience!