Size:24mm x 27mm.Drive square size (inch): 1/2,edge size (inch): 20. Material:carton steel. Double sized hexagon spanner with ratchet mechanism, ideal for scaffolding and construction. The surface after rust treatment, industrial quality, durable. Suitable widely in garage, workshop, carpentry, auto parts, specializing in machine repair and so on; It is a ideal and practical hand tool in home and garden DIY., Manufacturer: Funitric