This Pulsar Quartz Thick Bottom Banger is a pure quartz nail with a beveled bucket opening that provides a tight air seal with the user's carb cap for more effective vaporization. The bucket has a 5mm thick bottom quartz disk that retains heat and holds it over a longer period of time. Features a 90 degree joint and comes in a 14mm joint size. Bucket inner diameter measures 13mm in diameter.