Welcome to our store! [Product Overview] This HNV406LL is a professional-grade tool designed for precision and durability. Manufactured to Japanese standards, it ensures excellence in every task. [Key Features] To improve appearance quality and rust resistance, the surface treatment has been changed to electroless plating. The aluminum socket holder makes socket removal easy, increasing work efficiency. [Applications] For tightening and loosening bolts and nuts. Caution: Ensure the O-ring and pin are the correct size and securely fastened before use. O-rings and pins are consumables. Replace them if they are deteriorated or worn. [Technical Specifications] Drive Size (mm): 12.7 Across Flats Size (mm): 17, 19, 21, 22, 24 Across Flats Shape: Hexagonal Set Contents (pieces): 6 Socket Sizes: 17-24mm Type: Extra Long Set Contents: 4NV-17L100, 19L100, 21L100, 22L100, 24L100, 27L100 Across Flats (mm): 17, 19, 21, 22, 24 [About Our Items] All our products are 100% authentic and shipped directly from Japan. We specialize in providing professional tools like Makita, Fujiya (Kurokin), and Mitutoyo to enthusiasts and professionals worldwide. Should you have any questions about this HNV406LL, please feel free to contact us. Thank you for choosing Japanese craftsmanship!