Easy to use. Just install the keeper to your rod.Available Rod size : L ~ H Action(Fits most rod), Spinning or casting rod OK. Some of big game rod is not available.The Rubber's max length is about 1.7inch / 4.5cm. Please check your rod size before buy it. Condition : New in PackQTY. 1 Pack (2pcs of Keeper and 4pcs of Rubber Ring)