Insert lengths included in qty. Of 10:(M5x0.8x7.6mm / M5x0.8x10mm) (M6x1.0x9.4mm / M6x1.0x12mm) (M8x1.25x11.7mm / M8x1.25x16.2mm) (M10x1.25x16.2mm / M10x1.25x20mm) (M12x1.5x15mm / M12x1.5x19mm). Each set includes 5 complete tool kits with 20 inserts per kit "10 each of short and long" for a total of 100 inserts.