Get ready to start moving up in the world! This GEAR Premium smoking attachment is made of 100% borosilicate glass and allows you to convert 14mm to 19mm. This adapter can be used for either male or female bangers/bowls. You can use this adapter to: 1. Use a 19mm male banger/bowl with a 14mm joint; or 2. Use a 14mm female banger/bowl with a 19mm joint.