Feature: 1. HIGH STRENGTH MATERIAL -- Forged by high strength heat treated alloy steel, the Mandrel and Nose Piece Riveter Tip is solid, High quality and anti-rust. 2. LABELED STURDY CASE -- Come with a colorful sturdy plastic case for store and classify the size of different mandrels. 3. VARIOUSE SIZE OPTIONAL -- Metric M3, M4, M5, M6, M8, M10 and M12 all together 7 various size for choose. 4. ECONOMIC -- Save money and replace nut rivet mandrel instead of buying a new riveter! 5. UNIVERSAL FIT -- Fits many standard nut riveters. Specification: Features: HIGH STRENGTH MATERIAL -- Forged by high strength heat treated alloy steel, the Mandrel and Nose Piece Riveter Tip is solid, High quality 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 * M4 Mandrel 1 * Storage Box Package List: 1 * M4 Mandrel 1 * Storage Box