Description:- Suitable for oil filters in difficult to access areas 3 arms, for clockwise and counter-clockwise tightening female square drive Conforms to DIN 3120-C 10, ISO 1174 with adapter to female square drive Conforms to DIN 3120-C 12,5, ISO 1174, with ball retaining groove external hexagon 21 mm chrome-plated, adapter gunmetal-finish high grade tool steel