HIGH QUALITY: The materials used in their manufacture are obviously of high quality and are built to last. It feels solid and in your hand, giving you confidence that it stand up to regular use without any problems. It is just another tool in your toolbox that can continue to be used for years to come. USER-FRIENDLY: Easy to use and allows you to accurately unlock or open the door from the outside. Widely used: for emergencies such as firefighters needing to open doors to save lives, people who have lost their keys (especially in glass door stores), car owners with broken locks, etc. Note:Due to different production batches, there is slight color difference in kind, which not affect the use. How do J-Tools work? Tool Insertion: J-Tools have a unique "J" shaped end. This end is inserted into the keyway of the deadbolt. the long arm of the "J" shaped tool is inserted into the keyway while the short arm remains on the outside of the keyway. THUMB SWIVEL ENGAGEMENT: Once the J tool is inserted into the keyway, the long arm of the "J" engage the thumb swivel on the inside of the door. The thumbturn is the rotating part of the door lock that locks and unlocks the deadbolt. OPERATION: After the locksmith or professional has properly engaged the J-tool, turn the tool to mimic the action of turning the thumbturn from the inside. This action causes the deadbolt to retract, opening the door. OPENING THE DOOR: With the deadbolt retracted, the door can be opened from the outside to gain access to the locked area. Colour:As Shown Material:stainless steel Package Contents: 1 * Glass door repair wrench Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.