Double D shape Rotary Broaches, like D shape broaches, are used when rotational movement needs to be prevented. As with all Slater Tools Rotary Broaches, D shape broaches can be produced from hardened high speed M2 steel, PM4 or T15 cobalt. TiN, TiCN, and TiALN coatings are available for all rotary broaches. Pressure relief vent holes, spun ground diameters, corner radii, special tolerances, quantity discounts and resharpening are also offered.