Quick-release spring loaded bow knuckles for easy top removal; Includes six quick-release bow knuckles (2 large shaft, 4 small shaft) with 4 screws; Each knuckle approximately 2-5/8" long, large shaft 3/4" wide, small shaft 5/8" wide; Perfect fit, remove your top quickly and easily without tools; Converts most brands of soft tops to be tool-free and quick release; Once installed, there are no loose parts, and no need to find a torx tool or to keep track of your screws (just pull the knob to release pin from bracket); Great for dual-top models; 1997-2018 Compatible with Jeep Wrangler TJ LJ JK (will not fit 2014+ JK factory soft tops with lift assist bows); Automotive Grade Heavy Duty ABS Plastic; (note: does not fit 2018 JL Series, only fits JK Series)