Kryptonite Bicycle Security Gravity WheelNutz Bike Lock (M9) Gravity locking system that secures to your front wheel EASY INSTALLATION- only requires a 15mm wrench (No keys) WheelNutz provide internal"LOCK-OUT" FUNCTIONand can only be removed by turning the bike upside down 180 degrees Use in tandem with Messenger Mini to create a complete locking solution for your bike WEATHER PROTECTIVE COATINGkeeps WheelNutz from corroding In addition to popular M9 thread - M10 (001775) and 3/8" (001782) also available Product weight: .17 lbs (.77kgs) Only 81 grams per set Gravity locking system that secures to your front wheel Easy installation - only requires a 15mm wrench (No keys) WheelNutz provide internal "lock-out" function and can only be removed by turning the bike upside down 180 degrees Use in tandem with Messenger Mini to create a complete locking solution for your bike Weather protective coating keeps WheelNutz from corroding In addition to popular M9 thread - M10 (001775) and 3/8" (001782) also available