The Knuckle Up accessory is compatible with the entire selection of Vac-U-Lock attachments, with its one-size-fits-all knuckle rings sitting below a standard Vac-U-Lock plug.
Bullets For Easy Handheld Use of Vac-U-Lock Attachments Distinctive Brass Knuckles Shape Powerful Non-Slip Grip Use with Any Vac-U-Lock Compatible Attachment Description Taking hands-on play to the next level, this feisty Knuckle Up accessory will delight and amaze you with its novelty, functionality, and its undeniable ‘cool factor’. You won’t believe how versatile this toy is!
It’s perfect for both masturbation and playing with a partner! What are you waiting for?! Experience endless pleasurable possibilities with the most user-friendly sex toy system in the world.