Features: HIGH STRENGTH MATERIAL – Forged by high strength heat treated alloy steel, the Mandrel and Nose Piece Riveter Tip is solid, durable and anti-rust. LABELED STURDY CASE – Come with a colorful sturdy plastic case for store and classify the size of different mandrels. VARIOUSE SIZE OPTIONAL – Metric M3, M4, M5, M6, M8, M10 and M12 all together 7 various size for choose. ECONOMIC – Save money and replace nut rivet mandrel instead of buying a new riveter! UNIVERSAL FIT – Fits many standard nut riveters. Specification: Size: M3 / M4 / M5 / M6 / M8 / M10 / M12 (optional) Material: Alloy Steel Quantity: 1 pack Storage: Colorful Labeled Plastic Case Packing List: 1 * M8 Mandrel 1 * Storage Box