What is this?Toilet flapper chain broadly used on connecting toilets flapper with the bathroom flush lever(handle). Replacement for repairing lavatories or water tanks. What will I get?Product Name: Toilet Flapper Chain Material: 304 Stainless Steel Chain Length: 22cm / 8.66" Hook Length: 37mm / 1.46" C-shape Ring Size: 14x13mm / 0.55"x0.51" Single Link Size: 11x5.5mm / 0.43"x0.22" Package Content: 4 x Toilet Flapper Chain Are there any advantages of the product?Made of 304 chrome steel material, nice rust resistance, long provider life. The hook and c-shape ring on the chain ends are removable, so chain size is adjustable, you would want a longer or shorter chain in keeping with your need. How to apply it?Directly connect the C-shape ring on your to bathroom flapper and safe it, don't desire different tools. What must I notice?Please check the chain size before buying to substantiate it'll fit your toilet.