The Knuckle Grip is an Accessory released as part of the Beyblade Burst Evolution series. It was released in Japan on May 27th, 2017 for 648円. This was used by Rantaro Kiyama in Beyblade Burst Evolution after he found it in Trad's room.
Shooters and Grips - Beywiki, the Beyblade Encyclopedia
.com: Beyblade Burst B-83 Knuckle Grip : Toys & Games
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Knuckle Grip, Beyblade Wiki
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Knuckle Grip, Beyblade Wiki
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.com: Beyblade Burst B-83 Knuckle Grip : Toys & Games
Knuckle Grip, Beyblade Wiki
Launcher grip questions
What would've been a better Gem-Weapon for Sunstone? : r
Launcher Grip (Burst), Beyblade Wiki