The TCS Rocket Tire Plug Refill Pack contains fifteen 1.5mm replacement tire plugs and four anchors (two small and two large) that are optimized for use with the TCS Rocket Tire Plug Pack but will also work with most multitools in a pinch.The small anchor holds up to two plugs and can be pushed into the tire using a 2mm hexThe large anchor holds up to four plugs and is compatible with either a 2mm or 3mm hex