KING TONY 24-piece spline bit set, sizes 10 to 32 mm, 1/2 inch (12") drive, model 4028MR, designed for professional mechanical work and maintenance. It features high manufacturing quality and excellent hardness to withstand torque and impact, with a precise design that provides strong grip on nuts and reduces slippage during loosening and tightening, in addition to practical organization on a stand for ease of use.