In rugby union which players wear the shirt numbers six and seven?

Flanker is a position in the sport of rugby union. Each team of 15 players includes two flankers, who play in the forwards, and are generally classified as either blindside or openside flankers, numbers 6 and 7 respectively. The name comes from their position in a scrum in which they 'flank' each set of forwards. They fight for the ball, most commonly in rucks and mauls. Flankers also assist in pushing in a scrum, but are expected to detach from the scrum as early as possible in order to get to the play before the opposition's forwards. Flankers also participate in line-outs, either being lifted to contest or win possession, or to lift other players. Flankers are usually the key participants in the tackling process. Like other forward positions, flankers put more emphasis on strength than on speed.