Sliders or domeless titanium nails offer excellent heat retention, and come in three fitting styles - universal, adjustable & fixed joints in 10-14-18mm male or female, or both. In a few words, universal nails have both male & female joints that simultaneously fit rigs & water pipes. With adjustables nails, you can change the height to sit higher, lower or anywhere in between on your rig - adjustable nails can be both universal & fixed joint at the same time. Choosing the right Ti nail for you really depends on personal preference. DABS at WickiePipes has it all, domeless nails in dish, hollow & crown heads, sliders, honey buckets, sidekicks & hybrids.