OTC 5904 12 Piece Ribe Bit Socket Set Ribe profiles sometimes called polydrive are appearing everywhere and are becoming more popular everyday Manufactured with premium quality tool grade steel and are manufactured as two-piece construction for even stronger performance These high quality bit sockets will provide a lifetime of performance when used with hand tools Kit comes with one each 1/4 inch drive M4 M5 M6 3/8 inch drive M7 M8 M9 M10 M11 M12 1/2 inch drive M13 M14 and M15 Ribe Bit Sockets