sentence: A man in a red shirt begins talking in front of a wall of tool consisting of wrench,screws,ax and drills. sentence: He then holds up a small silver piece and begins sticking it into the chain of the bike. sentence: Next,he takes a black utensil,moves the pedals around and takes the chain completely off. sentence: He then takes a box with a new chain in it and puts it back on the bike and begins tightening the chain.