Wireless Solutions Holster for Samsung SCH-U310 Knack ? This holster is stylish and sophisticated way to carry your Samsung Knack U310 SmartPhone Easily attaches to your belt, and allows your Samsung Knack U310 to slide in it's cradle, locking it in position. A rotary clip, allows your phone to be adjusted on your belt to multiple positions, providing safety and convenience. Made of strong durable materials, that will hold your Samsung Knack U310 cell phone firmly in place. ? The swivel action allows holster to rotate 90 degrees in each direction- 180 degree movement.