Master Mechanic, 13 piece, pass thru socket set, includes: (10) spline sockets sizes: 5/16, 3/8, 7/16, 15/32, 1/2, 9/16, 19/32, 5/8, 11/16 & 3/4", extension bar, 3/8" drive adaptor & ratchet handle, all cr-v material, spline geometry works with 4, 6, 12 point, spline, external torx & rounded standard fasteners, meet or exceed all ANSI standards.