Makita Impact Adapter - B-66874. This adapter is designed for impact drivers and features a black coating to prevent rust. It is constructed from high strength, heat-treated S2 special steel and has precision-made tips for a perfect hold. It offers up to 20% more durability than standard bits. Specifications: Socket Type: Adaptor. Adaptor Size: 1/4"" Hex to 1/2\"" Square Drive. Product Range: Makita - Impact Black Adaptors. Country of Origin: China.