MAXIMUM PROTECTION CYLINDER: This 10 pin cylinder provides ultimate protection for your front door, with anti-drill, anti-pick and anti-shock protection as well as resistance to pulling out the plug. The cylinder has 4 specially designed combination pins for the snake groove keyway. ANTI-SNAP LINES The cylinder features anti-snap lines to prevent intruders from removing the cylinder and gaining access to your home. REVERSIBLE KEY WITH DIMPLE AND SNAKE GROOVE This cylinder uses a reversible key with dimple and snake safety groove designed to operate the 4 specially designed combination pins. With the dimple reversible key, the bite surface lies on the flat side of the blade and can be inserted into the cylinder from both sides.