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The gap wedge is a club designed to fit in between your pitching wedge and sand wedge. The gap wedge can also be known as an approach wedge. The loft on a pitching wedge is between 45-48 degrees and a sand wedge between is 54-58 degrees.
The gap wedge is between 50-54 degrees in order to fill the void between the two clubs. The gap wedge is used when faced with a yardage which is too short for a pitching wedge but too long for a sand wedge.
Over the past 10 years, there has been an increase on the number of wedge options available on the market. In years gone by, most people would just carry a pitching wedge and a sand wedge. Nowadays, the guys on the top level professional golf tours carry up to four wedges. Having the extra wedges in the bag makes controlling hitting the ball the desired distances much easier. For example, rather than having to fiddle about with your swing length to knock 10 yards off your full pitching wedge swing, you can just make your normal swing with a gap wedge to hit the ball the required distance.
To decide which wedges you should be carrying in your bag, visit a good club fitter or professional, then work out how far you hit your pitching wedge and then fill the gaps up to your highest lofted wedge.
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A gap wedge is not used for hitting through gaps. A gap wedge is a fairly high lofted wedge which fits the gap between your pitching wedge and sand wedge, hence the name. Filling this gap between wedges makes controlling the distance you want to hit the ball much easier.
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A gap wedge is not a brand of wedge. A gap wedge is a high lofted wedge with between 50 and 54 degrees of loft. This loft fills the gap between your 45-48 degree pitching wedge and your 55-58 degree sand wedge.
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A gap wedge can also be known as an approach wedge. The gap/approach wedge has between 50 and 54 degrees of loft on the face. Some manufacturers produce wedges which have the letter A stamped on the sole. Most manufacturers now produce wedges with a stated loft rather than a given name. Players may carry 48(PW), 52(GW), 56(SW), and 60(LW) degree wedges.