TROIKA Fidget Spinner with Knife and Bottle Opener. If you cross a Fidget Spinner with Do-It-Yourself, you get the TROIKA Spinning Tool. Just relax with it as a fidget spinner, or quickly utilise it as a mini tool. Fidget Spinner Bottle opener Small knife (2cm) with locking function. Made of stainless steel and aluminium, matt anodised.