Professional chisel for commercial or occasional use Spline bit set 1/2" drive so will fit any 1/2" drive ratchets / extensions / power bars etc.. 10mm hex shank perfect for limited access when a spanner is needed rather than use with a ratchet Male spline bits shallow and deep SET INCLUDES THE F0LLOWING - SHALLOW SPLINE BITS (30mm Long) - M5 / M6 / M8 / M10 and M12 - DEEP SPLINE BITS (75mm Long) - M5 / M6 / M8 / M10 and M12 Comes with a 1/2" adaptor which makes all bits suitable for use on a 1/2" drive ratchet Comes in a blow molded case for easy storage and transportation