RAM Mount Level Cup XL w/Single Socket for B Size 1" Ball [RAP-B-417-200-1U]Level Cup XL w Single Socket for B Size 1" Ball Designed for bigger insulated cups, plastic water bottles or even your reliable steel coffee cup, the Level Cup XL keeps your drink upright, regardless of the conditions. This kit includes a Level Cup XL that has an integrated single socket arm. This cup holder can attach to any B size base or RAM Mounts B size ball accessory. The oversized opening cradles the biggest of gulps and the adjustable bottom