3-PW is a 3 iron through to pitching wedge. 4-AW is 4 iron through to approach wedge, and approach wedge is mainly referred to as a Gap wedge as it fills the gap between a pitching wedge and a sand wedge, it is usually around 50-52 degrees of loft. The 4-AW set allows a player who maybe doesn't like long irons to have more scoring options on the shorter shots. Although it would not be uncommon for someone to have 3-PW, then a gap wedge and a sand wedge.
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