The anti Snap may include a toughened spine system or trapping system to prevent cylinder being manipulated with tools. These all have a variety of skill applied. BS1303 is in reality a durability standard. It defines corrosion characteristics and the number of operations that might be expected in a lock`s lifetime along with testing to resist drill, chisel, plug pulling and twist attacks. There is no picking or bumping tested by the standard. One has to wonder why really. Although I now see sold secure are offering an advanced test level on these products.