What is the difference between the single boxing glove button and the double boxing gloves?

单一的拳击手套按钮和两个拳击手套形的按钮有什么区别？

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Altuve singled and Jason Castro grounded a double off the glove of a diving Nix at third base.

WSJ: Astros fight back, fall short in loss to Yankees

Pittsburgh made it 3-0 when Tejada struggled to get the ball out of his glove and double-clutched a throw on Marte's run-scoring single to shortstop.

WSJ: Umps get it right on Jones' HR, Pirates beat Mets

Pittsburgh made it 3-0 when Ruben Tejada struggled to get the ball out of his glove and double-clutched a throw on Starling Marte's run-scoring single to shortstop.

WSJ: Marcum exits early again, Mets lose to Pirates 7-3