A dedicated set of bump keys for the Yale 1109 new profile rim cylinders. These are 5 pin cylinders with a special anti bump chamber in any one of the 5 positions. This means that traditional bump keys would have very very limited success rate on these locks as the lowest cuts would struggle to touch the pin in the anti bump chamber. As qualified master locksmiths we have taken these cylinders apart and created an exceptional set that jumps the success rate to 100%. By locating the correct chamber using our unique reader key (watch video for instructions) select the correct key and fully insert and then 'static bump' the lock. They normally open within 10 seconds. If unsure of the correct chamber simply work through the keys. These are cut on original Yale blanks which are much much tougher than copies, especially important on static bunmping and also dealing with the latch presssure.