This GearWrench Laminated Ratcheting Box Wrench, 6 Point 25° Offset, 9mm x 10mm (54-640G) has an open head and body design for easy cleaning and to ensure dirt and debris don't get trapped which could block the ratcheting mechanism. The opening is broached for an accurate non-slip fit on fasteners. GearWrench laminated box wrenches are heat treated for durability and are chrome plated for corrosion resistance. The ratcheting direction can be reversed by turning the wrench over.