Compatible with these Kryptonite U-Locks: New York series, Evolution series, Krytolok series. Flexible strap fits frame tubes from 0.875 to 1.5 inches (22.2mm - 38.1mm) Quick release button allows east loading and unloading of lock. *Does not include two splines that fit 1/2" (13mm) and 5/8" (16mm) round shackles.