Each set includes 3 complete tool kits. Each kit contains 20 inserts. 10 short and 10 long each" for a total of 60 inserts. You can add 2 additional kits later. Thread Size = M6x1.0, M8x1.25, M10x1.25 Insert length is included in the kit. 10 pcs each: Mini Master Kit p/n 1202 (M6x1.0x9.4mm / M6x1.0x12mm) (M8x1.25x11.7mm / M8x1.25x16.2mm) (M10x1.25x14mm / (10x1.25x20mm)