High compatibility 6/7/8-speed link:Always make sure you order the right one for the particular speed of the gears.This 6/7/8-speed missing link is compatible with all 7mm wide 6/7/8-speed bike chains.It will fit both of your mountain and road bikes or orther bikes that use the same type of chain.They worked fine with having to add a few links more to your existing chain.A light but necessary components:Bikes need a surprising high effort to go uphill and that's when the chances to have the original chain breaking are higher.These links weigh so light that you can just leave them in your biking back pack just incase the dread snapped chain happens.Its your chance to be that hero of the day when you or your mates need one master links - a great highlight moments.Requires no tool for installation and removal:No need for the special tool, just grab the chain either side of the link with a cloth to avoid slipping,give a sharp tug in opposite directions and the link snaps nicely into place.Being caught out in the back of beyond miles from anywhere when a chain snap is hard.You can use these to fix it right away and go back out on the trails within minutes.Up to 5 reusability times:These worked fine as apart with having to add a new one to repair your daughters bike.And when your child grow up(children grows faster than you expect) if they want to remove them then assemble one whole chain for a new bike,the links wouldn't break easily and works great,saved you from buying a new chain.Nicely made Fine steel:You might noticed that the links aren't as thick as others that you have used before.With the helps of well-made steel,the links are lighter and keeping the amount of scratch between the pins and the connect inner links as small as possible.You can test these on mountain trails without worry about chain breaks, chain derailments, or shifting issues even under high torque.