It gives 1 point extra to your prayer points. At 43 Prayer, you get 18 Points per dose of prayer potion At 44 Prayer, you get 19 Points per dose of prayer potion At 52 Prayer, you get 21 Points per dose of prayer potion You have +26 to your prayer.. so your going to be draining 1 point of prayer every 5.6 Seconds You have 18 Ppots.. Because of one less inventory place for wrench At 43 Prayer, your going to last 121.7 Minutes with prayer on constantly (.4minutes more than with no wrench) At 44 Prayer, your going to last 128.4 Minutes with prayer on constantly (Roughly the same as using no wrench) At 52 Prayer, your going to last 142 Minutes with prayer on constantly (Slightly less than when using no wrench) Remeber though.. if using the wrench you have 18 ppots rather than 19, but you are getting roughtly the same time. Therefore.. i'd reccomend that you take the wrench, as you get roughly the same amount of prayer restored, but you use one less prayer potion. POTY