New Helmet Adjuster Strap Portable Replacement Universal Helmet Retention System Lightweight Parts For Cycling Accessories Description: * new and high quality *Made of high quality material, and functional * Easily adjust the head circumference to ensure the stability of the helmet *Installation : Turn the knob to the maximum head circumference, fix the adjuster on the helmet with adhesive tape, check whether the position of the nail and the hole are consistent, record the position of the hole, and then consider the installation , cut off the excess parts, and then punch hole, embedded in the hidden button, and finally installed *Great for cycling, skiing, skating, equestrian, mountaineering helmets Specification: * Material: Plastic *Color: Black (As Pictures Show) *Size: spacing: Approx. 21mm (As Pictures Show) *Weight: about 60g Package includes: 1x Helmet Adjuster Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. _x000D_ _x000D_