These are channel balance accessories.
x 5/8 in.Used to repair channel balances in single hung and double hung windows9/16 in.Channel Balance Accessories, Plastic and Steel Components channelWhite in colorPlastic and steel componentsFor further dimensional information, please see the line drawing The package contains: 2 top guides and 2 bottom guides, 4 rivets and 2 take-out clips which is enough to repair 1 window with 2 channel balances..