Rocket Tire Plug Refill PackThe Tubeless Tire Plug Pack kit contains fifteen 1. 5 mm tire plugs and four anchors (two small and two large) that are optimized for use with the TCS Rocket Tire Plug Kit Also work with most multi tools in a pinch The small anchor holds up to two plugs and can be pushed into the tire using a 2 mm hex The large anchor holds up to four plugs and is compatible with either a 2 mm or 3 mm hex